Re: [Tutor] how to sort a tab delim file

[vince spicer]

On Wed, Jan 13, 2010 at 9:21 AM, Hs Hs  wrote:

> Hi:
>
> I have a tab-delim file:
>
> col1 col2 col3
> andrew1987   1990
> jake 1974   1980
> jim   1964   1970
> lance1984   1992
>
>
> how can I sort column 2 and get :
> jim   1964   1970
> jake 1974   1980
> lance1984   1992
> andrew1987   1990
>
>
> I know how to sort a items in one list. but I cannot get how this can be
> done on a file.
>
> any suggestions. thanks!
> Hs
>
>
>
>
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>

Sounds like a school project to me
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Re: [Tutor] how to sort a tab delim file

[vince spicer]

On Wed, Jan 13, 2010 at 9:21 AM, Hs Hs  wrote:

> Hi:
>
> I have a tab-delim file:
>
> col1 col2 col3
> andrew1987   1990
> jake 1974   1980
> jim   1964   1970
> lance1984   1992
>
>
> how can I sort column 2 and get :
> jim   1964   1970
> jake 1974   1980
> lance1984   1992
> andrew1987   1990
>
>
> I know how to sort a items in one list. but I cannot get how this can be
> done on a file.
>
> any suggestions. thanks!
> Hs
>
>
>
>
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>
http://diveintopython.org
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Re: [Tutor] help with strings

[vince spicer]

On Wed, Feb 3, 2010 at 7:19 AM, NISA BALAKRISHNAN <
snisa.balakrish...@gmail.com> wrote:

> hi
>
> I am very new to python.
> I have a string for example : 123B new Project
> i want to separate 123B as a single string and new  project as another
> string .
> how can i do that.
> i tried using partition but couldnt do it
>
> pls help.
> thanks in advance!
>
>
Can we see some example code you are trying?

Vince
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Re: [Tutor] html and python

[vince spicer]

On Wed, Feb 10, 2010 at 1:30 PM, Grigor Kolev wrote:

> Hi.
> I want to make a list of E-mail, photos and some additional data.
> But I want this list to be displayed in one site.
> How can I send data from a list of site page. Which module should I use
> --
> Grigor Kolev 
>
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do you have any code currently?
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Re: [Tutor] html and python

[vince spicer]

On Wed, Feb 10, 2010 at 1:30 PM, Grigor Kolev wrote:

> Hi.
> I want to make a list of E-mail, photos and some additional data.
> But I want this list to be displayed in one site.
> How can I send data from a list of site page. Which module should I use
> --
> Grigor Kolev 
>
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Your best bet is show us some code .. then we can help.

Vince
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Re: [Tutor] Compile py to exe in ubuntu

[vince spicer]

On Wed, Feb 10, 2010 at 1:40 PM, Harya Dananjaya wrote:

> Can I compile my python source to exe in ubuntu?
> if I can do it, which compiler can do it?
>
> Thanks you,
>
> Harya Dananjaya
>
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1. Ubuntu and linux in general don't use exe per say
2. Python can be compiled but not usually in the way you are thinking
3. you might check out http://pypi.python.org/pypi/bbfreeze/
Vince
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Re: [Tutor] test

[vince spicer]

On Thu, Feb 25, 2010 at 4:03 PM, Kirk Bailey wrote:

> test
> --
>
>
> Cheers!
>  -Kirk D Bailey
>
>  THINK
> +-+
>  .*.| BOX |
>  ..*+-+
>  *** THINK
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Hello World! << usually a good test
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Re: [Tutor] Append sub-key to dictionary

[vince spicer]

On Tue, May 25, 2010 at 12:28 PM, M. Bashir Al-Noimi wrote:

>  Hi All,
>
> I'm trying to append a new sub-key to specific dictionary but it replacing
> the content of parent key instead of add a sub-key!
>
>
> How I can fix this issue?
>
> --snippet--
>
> addressbook = {
>'work': {
>  'Andre': {
>   'phone': '22761654',
>   'e-mail': '5456646',
>   'address': 'Syria, Aleppo',
>   'website': 'www.sdff.com'
>   }
> },
> 'Friends': {
> 'Ahmad': {
>  'phone': '34646464',
>  'picture': '/home/fiends/wael.png',
>  'posts': {
>'blog': 'http://www.dsfd.com/',
>'newspaper': 'http://news.com/'
>}
>  },
> 'Issa': {
>  'e-mail': 'a...@dsfdsc.com'
>  }
> }
>}
>
> addressbook['Friends'] = {
>'kassem': {
>'address':'Aleppo Street',
>'Country':'Palestine',
>'articles':{
>
> 'blog':'http://blogger.com',
>'news':'http://news.com/'
>}
>}
>}
>
>
>  --
> Best Regards
> Muhammad Bashir Al-Noimi
> My Blog: http://mbnoimi.net
>
>
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You may have better results with:

addressbook['Friends']['kassem"] = {
   'address':'Aleppo Street',
   'Country':'Palestine',
   'articles':{
   'blog':'
http://blogger.com',
   'news':'http://news.com/'
   }
   }
   }


this will create a new key in the Friends dict

Vince
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Re: [Tutor] List comprehension for dicts?

[Vince Spicer]

Hey you can use list comprehension here

age_dict = { 'pete': 42, 'ann': 25, 'carl': 30, 'amanda': 64 }

you can create a dict from a list of tuples and you can access the dict as
a
list of tuples by accessing its items

Example:

age_dict = dict([(key.upper(), value) for key,value in age_dict.items()])

hope that helps,

Vince

On Thu, Aug 19, 2010 at 8:51 AM, Pete  wrote:

> Hi,
>
> I've been reading up on list comprehensions lately, all userful and
> powerful stuff - trying to wrap my brain around it :)
>
> As the examples all seem to relate to lists, I was wondering if there is an
> elegant similar way to apply a function to all keys in a dictionary?
>
> (without looping over it, of course)
>
> I'm trying to convert all keys in a dict to uppercase, as in:
>
> INPUT:
> age_dict = { 'pete': 42, 'ann': 25, 'carl': 30, 'amanda': 64 }
>
> OUTPUT:
> age_dict = { 'PETE': 42, 'ANN': 25, 'CARL': 30, 'AMANDA': 64 }
>
> I googled 'dictionary comprehension' but couldn't get any code to work with
> the examples given.
>
> http://www.siafoo.net/article/52#dictionary-comprehensions
>
> thanks,
>
> Pete
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Re: [Tutor] If/elif/else when a list is empty

[Vince Spicer]

On Mon, Sep 13, 2010 at 9:58 PM,  wrote:

>  Hi,
>
> I'm parsing IMDB movie reviews (each movie is in its own text file). In my
> script, I'm trying to extract genre information. Movies have up to three
> categories of genres--but not all have a "genre" tag and that fact is making
> my script abort whenever it encounters a movie text file that doesn't have a
> "genre" tag.
>
> I thought the following should solve it, but it doesn't. The basic question
> is how I say "if genre information doesn't at all, just make
> rg1=rg2=rg3="NA"?
>
> rgenre = re.split(r';', rf.info["genre"]) # When movies have genre
> information they store it as Drama;Western;Thriller
>
> if len(rgenre)>0:
>   if len(rgenre)>2:
>   rg1=rgenre[0]
>   rg2=rgenre[1]
>   rg3=rgenre[2]
>   elif len(rgenre)==2:
>   rg1=rgenre[0]
>   rg2=rgenre[1]
>   rg3="NA"
>   elif len(rgenre)==1:
>   rg1=rgenre[0]
>   rg2="NA"
>   rg3="NA"
>else len(rgenre)<1: # I was hoping this would take care of the "there is
> no genre information" scenario but it doesn't
>rg1=rg2=rg3="NA"
>
> This probably does a weird nesting thing, but even simpler version I have
> tried don't work.
>
> Thanks very much for any help!
>
> Tyler
>
>
>
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>
Hey Tyler you can simplify this with a onliner.

rg1, rg2, rg3 = rgenre + ["NA"]*(3-len(rgenre[:3]))

Hope that helps, if you have any questions feel free to ask.

Vince
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Re: [Tutor] If/elif/else when a list is empty

[Vince Spicer]

Tyler,

This is a simple error the KeyError is caused because the key isn't in the
dictionary
http://docs.python.org/library/exceptions.html#exceptions.KeyError and easy
fix you can either check for the key prior to using or use the get method

1) rgenre = re.split(r';', rf.info["genre"]) if "genre" in rf.info else []
the regex will never get executed here and an empty list will be returned if
genre not present

2) rgenre = re.split(r';', rf.info.get("genre", ''))
the get will not throw this error and return '' if ''genre' is not found in
the dictionary

Hope that helps,

Vince
<http://docs.python.org/library/exceptions.html#exceptions.KeyError>

On Mon, Sep 13, 2010 at 10:46 PM,  wrote:

> Hi Vince,
>
> Thanks very much for the one-line version--unfortunately, I still get
> errors. The overall script runs over every text file in a directory, but as
> soon as it hits a text file without a  tag, it gives this error:
>
> Traceback (most recent call last):
>   File
> "C:\Users\tylersc\Desktop\Tyler2\Tyler\words_per_review_IMDB_9-13-10.py",
> line 168, in 
> main(".","output.csv")
>   File
> "C:\Users\tylersc\Desktop\Tyler2\Tyler\words_per_review_IMDB_9-13-10.py",
> line 166, in main
> os.path.walk(top_level_dir, reviewDirectory, writer )
>   File "C:\Python26\lib\ntpath.py", line 259, in walk
> func(arg, top, names)
>   File
> "C:\Users\tylersc\Desktop\Tyler2\Tyler\words_per_review_IMDB_9-13-10.py",
> line 162, in reviewDirectory
> reviewFile( dirname+'/'+fileName, args )
>   File
> "C:\Users\tylersc\Desktop\Tyler2\Tyler\words_per_review_IMDB_9-13-10.py",
> line 74, in reviewFile
>
> rgenre = re.split(r';', rf.info["genre"])
> KeyError: 'genre'
>  I'm about to give what may be too much information--I really thought
> there must be a way to say "don't choke if you don't find any rgenres
> because rf.info["genre"] was empty". But maybe I need to define the "None"
> condition earlier?
>
> Basically a text file has this structure:
> 
> High Noon
> Drama;Western # But this tag doesn't exist for all text
> files
> # etc
> 
> 
> u493498
> 9 out of 10
> A great flick
> blah blah blah
> # etc
> 
> # next review--all about the movie featured in the info tags
>
>
>
>
> -Original Message-
> From: Vince Spicer 
> To: aenea...@priest.com
> Cc: tutor@python.org
> Sent: Mon, Sep 13, 2010 9:08 pm
> Subject: Re: [Tutor] If/elif/else when a list is empty
>
>
>
> On Mon, Sep 13, 2010 at 9:58 PM,  wrote:
>
>> Hi,
>>
>> I'm parsing IMDB movie reviews (each movie is in its own text file). In my
>> script, I'm trying to extract genre information. Movies have up to three
>> categories of genres--but not all have a "genre" tag and that fact is making
>> my script abort whenever it encounters a movie text file that doesn't have a
>> "genre" tag.
>>
>> I thought the following should solve it, but it doesn't. The basic
>> question is how I say "if genre information doesn't at all, just make
>> rg1=rg2=rg3="NA"?
>>
>> rgenre = re.split(r';', rf.info["genre"]) # When movies have genre
>> information they store it as Drama;Western;Thriller
>>
>> if len(rgenre)>0:
>>   if len(rgenre)>2:
>>   rg1=rgenre[0]
>>   rg2=rgenre[1]
>>   rg3=rgenre[2]
>>   elif len(rgenre)==2:
>>   rg1=rgenre[0]
>>   rg2=rgenre[1]
>>   rg3="NA"
>>   elif len(rgenre)==1:
>>   rg1=rgenre[0]
>>   rg2="NA"
>>   rg3="NA"
>>else len(rgenre)<1: # I was hoping this would take care of the "there
>> is no genre information" scenario but it doesn't
>>rg1=rg2=rg3="NA"
>>
>> This probably does a weird nesting thing, but even simpler version I have
>> tried don't work.
>>
>> Thanks very much for any help!
>>
>> Tyler
>>
>>
>>
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>>
>>
> Hey Tyler you can simplify this with a onliner.
>
>  rg1, rg2, rg3 = rgenre + ["NA"]*(3-len(rgenre[:3]))
>
>  Hope that helps, if you have any questions feel free to ask.
>
>  Vince
>
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Re: [Tutor] "Overloading" methods

[Vince Spicer]

On Thu, Sep 16, 2010 at 6:02 AM, Michael Powe  wrote:

> Hello,
>
> Strictly speaking, this isn't overloading a method in the way we do it
> in Java.  But similar.  Maybe.
>
> I am writing a module for processing web server log files and one of
> the methods I provide is to extract a given query parameter and its
> value. Because there are several types of log files with different
> line structures, I had the thought to write methods with descriptive
> names that simply returned a generic method that processed the method
> arguments. e.g.,
>
> def setpattern_iis(self,pattern,parameter) :
>type='iis'
>return pattern_generator(self,type,pattern,parameter)
>
> In this case, creating a regular expression to parse the log lines for
> a query parameter.
>
> This is just a bit more "self documenting" than using the generic
> method with the 'type' argument and requiring the user to enter the
> type.  At the same time, it allows me to put all the parsing code in
> one method.
>
> My question is, is this a bad thing to do in python?
>
> Thanks.
>
> mp
>
> --
> Michael Powemich...@trollope.orgNaugatuck CT USA
> War is a sociological safety valve that cleverly diverts popular
> hatred for the ruling classes into a happy occasion to mutilate or
> kill foreign enemies. - Ernest Becker
>
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>
Well I can't comment on right or wrong I would think creating a simple class
with a __call__ method is a
little more pythonic.

Example:

class PatternGenerator(object):
"""Run a regex."""
def __init__(self, type_):
self.type = type_
def __call__(self, pattern, parameter):
return pattern_generator(self, self.type, pattern, parameter)

# Initialize class
setpattern_iis = PatternGenerator('iis')

# call the method here
setpattern_iis("pattern", "params")

Hope that helps,

Vince
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Re: [Tutor] Comparing two lists

[Vince Spicer]

On Thu, Sep 16, 2010 at 12:27 PM, Michael Powe  wrote:

> Hello,
>
> I have two lists.
>
> alist = ['label', 'guid']
>
> blist = ['column0label', 'column1label', 'dimension0guid',
> 'description', 'columnid']
>
> I want to iterate over blist and extract the items that match my
> substrings in alist; alternatively, throw out the items that aren't in
> alist (but, I've had bad experiences removing items from lists "in
> place," so I tend toward the "copy" motif.)
>
> In real life, blist column entries could have embedded column numbers
> from 0 to 19.
>
> I can do this with excrutiatingly painful 'for' loops.  Looking for
> something more efficient and elegant.
>
> Thanks.
>
> mp
>
> --
> Michael Powemich...@trollope.orgNaugatuck CT USA
>
> "The secret to strong security: less reliance on secrets."
> -- Whitfield Diffie
>
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>
Michel,

One solution is to use list comprehensions.

newlist = [x for x in blist if [a for a in alist if a in x]]

This works, although there may be more efficient ways to accomplish this

Vince
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Re: [Tutor] Comparing two lists

[Vince Spicer]

On Thu, Sep 16, 2010 at 12:49 PM, Vince Spicer  wrote:

>
>
> On Thu, Sep 16, 2010 at 12:27 PM, Michael Powe wrote:
>
>> Hello,
>>
>> I have two lists.
>>
>> alist = ['label', 'guid']
>>
>> blist = ['column0label', 'column1label', 'dimension0guid',
>> 'description', 'columnid']
>>
>> I want to iterate over blist and extract the items that match my
>> substrings in alist; alternatively, throw out the items that aren't in
>> alist (but, I've had bad experiences removing items from lists "in
>> place," so I tend toward the "copy" motif.)
>>
>> In real life, blist column entries could have embedded column numbers
>> from 0 to 19.
>>
>> I can do this with excrutiatingly painful 'for' loops.  Looking for
>> something more efficient and elegant.
>>
>> Thanks.
>>
>> mp
>>
>> --
>> Michael Powemich...@trollope.orgNaugatuck CT USA
>>
>> "The secret to strong security: less reliance on secrets."
>> -- Whitfield Diffie
>>
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>>
>>
> Michel,
>
> One solution is to use list comprehensions.
>
> newlist = [x for x in blist if [a for a in alist if a in x]]
>
> This works, although there may be more efficient ways to accomplish this
>
> Vince
>
>
On major speed up is to make a simple filter that returns as soon as a match
is found instead of
completing the loop every element in alist

def filter_(x, against):
for a in against:
if a in x:
return True
return False

newlist = [x for x in blist if filter_(x, alist)]

:)

Vince
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Re: [Tutor] Getting/setting attributes

[Vince Spicer]

On Tue, Sep 21, 2010 at 4:16 PM, bob gailer  wrote:

>  On 9/21/2010 5:06 PM, lists wrote:
>
>> Hi tutors,
>>
>> I'm trying to each myself programming and come from a background in
>> system administration with some experience in scripting (so I'm very
>> new to it).
>>
>> Currently I'm grappling with the concept of object orientating
>> programming and have a question about setting&  getting attributes.
>>
>> As I understand it, it makes most sense to set/get the attribute of an
>> object using a method rather than doing it directly.
>>
>
> My opinion - unless there is some verification or translation or action
> required it is better (easier, clearer) to just access and assign the
> attribute directly.
>
>
>  I've been reading various ways of doing this, and the information seems a
>> little
>> contradictory.
>>
>>  Example, please?
>
>  I've muddled my way through the code below to try and force setting or
>> getting the 'address' attribute through the address method rather than
>> allowing direct access.
>>
> Just because you have a getter and setter does not prohibit direct
> reference to _address.
>
>> Does this make sense to you?
>>
>>
>> class Computer(object):
>>
>>def __init__(self):
>>"""instantiate the class with default values"""
>>self.address = ""
>>
>>  I suggest (if you want to go the setter/getter route that you initialize
> _address, just in case someone tries to reference it without setting it.
>
>
> @property # use the property.getter decorator on this method
>>def address(self):
>>return self._address
>>
>>@address.setter #use the property.setter decorator on this method
>>def address(self, addrvalue):
>>self._address = addrvalue
>>
>> computer1 = Computer()
>> computer1.address = "test"
>> print computer1.address
>>
>>
> --
> Bob Gailer
> 919-636-4239
> Chapel Hill NC
>
>
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Hello Bob,

Here is a working example of what I think you are trying to achieve. In this
example the address is set via the setter
and some simple validation is there and the private var isn't available as
__address but get rewritten to _Computer__address (so not private but not
obvious)


class Computer(object):
def __init__(self):
    self.__address = None
# see note on private vars in Python
http://docs.python.org/tutorial/classes.html?highlight=private#private-variables

   @property
def address(self):
return self.__address

@address.setter
def address(self, value):
if value not in ("available", "criteria"):
raise AttributeError("Nope")
self.__address = value


Hope that helps,

Vince Spicer


-- 
Sent from Ubuntu
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Re: [Tutor] dynamic arrays?

[Vince Spicer]

On Mon, Sep 27, 2010 at 9:32 AM, Alex Hall  wrote:

> Hi all,
> One thing I have never much liked about Python is its need for
> specifically sized arrays and lack of a dynamic, array-like data
> structure. For example, the following fails with a "list assignment
> index out of range" error:
>
> a=[]
> i=0
> for l in open("file.txt", "r"):
>  a[i]=l
>   i+=1
>
> Is there something in Python I am missing that would let the above
> work? I am hoping that my annoyance at the apparent lack of such a
> thing is unfounded. BTW, I know why the above throws that exception.
> TIA.
>
> --
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> Alex (msg sent from GMail website)
> mehg...@gmail.com; http://www.facebook.com/mehgcap
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Your method works ok for dictionaries but when working with lists
you can append data.

#method 1: works with any iterator
data=[]
for line in open("file.txt", "r"):
data.append(line)

#method 2: this will convert a file into an array
data = open("file.txt", "r").readlines()

#method 3: if you had to know the line number
a = []
for i, line in enumerate(open('flie.txt')):
print i, line
a.append(line)

Hope this helps
-- 
Vince Spicer
Lead Developer - MCE Computing

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Re: [Tutor] Statistic-Program Problems! Please Help Quickly!

[Vince Spicer]

On Thu, Oct 14, 2010 at 10:11 PM, Colleen Glaeser
wrote:

> BTW, the error message my program gives me for the B and M functions is:
>
> Traceback (most recent call last):
>   File "I:\Lab 7 wierd stat data.py", line 49, in 
> B()
>   File "I:\Lab 7 wierd stat data.py", line 44, in B
>
> ((Y() * Q()) - (P() * X())) / ((6 * Q()) - (X()**2))
> TypeError: unsupported operand type(s) for *: 'NoneType' and 'NoneType'
>
> On Thu, Oct 14, 2010 at 11:09 PM, Colleen Glaeser  > wrote:
>
>> Dear tutors,
>>
>> I am in a beginning-level computer science class in college and am running
>> into problems with an assignment.
>>
>> The assignment is as follows:
>>
>> Statisticians are fond of drawing regression lines.  In statistics and
>> other fields where people analyze lots of data, one of the most commonly
>> used regression lines is called the “least squares line.” This is the line
>> that is supposed to best fit the set of data points, in the sense that it
>> minimizes the squared vertical distances between the points and the line.
>> Why this should be a good fit is beyond the scope of this assignment.
>>
>> Presume that you have a collection of n two-dimensional data points.  I’ll
>> give it as a list of lists, where each of the lists inside represents one
>> data point.
>>
>> Data :[ [x1, y1], [x2, y2], [x3, y3], …, [xn, yn]]
>>
>> Compute the following
>>
>>   The regression line is then given by
>>
>> where m and b may be obtained by
>>
>> and
>>
>> Your task is to compute the m and b (slope and intercept, respectively)
>> for a set of data.  You have to analyze the data as given, not count or
>> add anything yourself.  Your program should do everything, even figure
>> out how many data points there are.
>>
>> Here’s your data:
>>
>> First set:  [ [3, 1], [4, 3], [6, 4], [7, 6], [8, 8], [9, 8] ]
>>
>> Second set:  [ [63, 11], [22, 7.5], [63, 11], [28, 10], [151, 12], [108,
>> 10], [18, 8], [115, 10], [31,7], [44, 9] ]
>>
>> Find m and b, then calculate an estimate for x = 5 using the first data
>> set.  That is, plug in 5 for x and see what y you get.  For the second
>> set, try x = 95.
>>
>> Turn in:  code, m, b, and the estimates for both data sets.
>>
>>
>>
>>
>> ***
>>
>> There’s an easy way to walk through the data and extract the values you
>> need.  Use a for loop.  Try this:
>>
>> for item in data:
>>
>> [x, y] = item
>>
>> print(x)
>>
>>
>> ~~
>>
>> For extra credit:  draw a scatter plot of the data, and draw in the least
>> squares line.  Scale the window to fit, making it a bit wider and higher
>> than the data requires, so that some of the points are near but not on the
>> edges of the window.  Then sketch in the regression line.  Note that you
>> should calculate the window size based on the data – don’t set them
>> yourself; find the max and min values for x and y.  You can print the
>> scatter plot, or point me toward your web page.  In any case, show me the
>> code.
>>
>>
>>
>> So far, my program is as follows:
>>
>> Data = [[3,1],[4,3],[6, 4],[7, 6],[8, 8],[9, 8]]
>>
>> def X():
>> accX = 0
>> for item in Data:
>> [x,y] = item
>>
>> accX = accX + x
>> print (accX)
>>
>>
>> def Y():
>> accY = 0
>> for item in Data:
>> [x,y] = item
>>
>> accY = accY + y
>> print (accY)
>>
>> def P():
>> accXY = 0
>> for item in Data:
>> [x,y] = item
>>
>> accXY = accXY + (y*x)
>> print (accXY)
>>
>> def Q():
>> accX2 = 0
>> for item in Data:
>> [x,y] = item
>>
>> accX2 = accX2 + (x**2)
>> print (accX2)
>>
>> X()
>> Y()
>> P()
>> Q()
>>
>>
>>
>> def B():
>> ((Y() * Q()) - (P() * X())) / ((6 * Q()) - (X()**2))
>>
>> def M():
>> ((Y() * Q()) - (P() * X())) / (X() * Q())
>>
>> B()
>> M()
>>
>> Now, my functions for X, Y, P, and Q are correct, but I have a couple of
>> problems when it comes to continuing.  First of all, despite what my teacher
>> has told me, my method for trying to multiply X,Y,P, and Q's results in the
>> functions for B and M are not working.  I'm not sure if there is a way to
>> make functions into variables or how to solve this problem.
>>
>> Second, I am confused as to what my teacher means to do when it comes to
>> inputting different values of x.
>>
>> Find m and b, then calculate an estimate for x = 5 using the first data
>> set.  That is, plug in 5 for x and see what y you get.  For the second
>> set, try x = 95.
>>
>> Turn in:  code, m, b, and the estimates for both data sets.
>>
>>
>> I mean, I know I need to calculate the line of best fit for the data sets
>> using B and M, but what in the world is x supposed to do and where does it
>> go?  How do I program this?  This is especially harder since I've never
>> taken a proper stat class befo

Re: [Tutor] Requesting restricted URL (further authentication requested)

[Vince Spicer]

On Tue, Oct 19, 2010 at 1:56 PM, Tim Johnson  wrote:

> I've written the following function which successfully gets an
> authenticated URL:
> def getRestrictedURL(authName,URL,log,pswd):
>auth_handler = urllib2.HTTPBasicAuthHandler()
>auth_handler.add_password(authName, URL,log,pswd)
>opener = urllib2.build_opener(auth_handler)
>urllib2.install_opener(opener)
>return opener.open(URL).read()
> # But, alas, any links in content 'beneath' the URL
> # require additional authentication.
> Any way around this?
> Thanks
> --
> Tim
> tim at johnsons-web.com or akwebsoft.com
> http://www.akwebsoft.com
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Tim,

Unless you are tied to the standard library I would recommend looking at

httplib2  http://code.google.com/p/httplib2/

This handles your authentication and connection much better then the
standard urllib.

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Re: [Tutor] rights

[Vince Spicer]

On Mon, Nov 1, 2010 at 2:05 PM, Chris King  wrote:

>  Dear Tutors,
>How do you give a script right to read a folder?
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Which Operation System?

In linux the user that is running the script must be have read access

chmod +r folder


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Re: [Tutor] pythonpath

[Vince Spicer]

On Mon, Nov 1, 2010 at 3:41 PM, Chris King  wrote:

>  Dear Tutors,
>When I try to import a module, how can I make it look in certain
> directories for them easily.
> Sincerely,
>Chris
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Hello Chris

You can manage you path from within your script,

import sys
sys.path.append("/home/user/lib")

Or in bash you can edit your  $PYTHONPATH env variable
echo $PYTHONPATH


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Re: [Tutor] pythonpath

[Vince Spicer]

On Mon, Nov 1, 2010 at 3:58 PM, Chris King  wrote:

>  On 11/1/2010 5:57 PM, Vince Spicer wrote:
>
>
>
> On Mon, Nov 1, 2010 at 3:54 PM, Chris King  wrote:
>
>>   On 11/1/2010 5:47 PM, Vince Spicer wrote:
>>
>>
>>
>> On Mon, Nov 1, 2010 at 3:41 PM, Chris King  wrote:
>>
>>>  Dear Tutors,
>>>When I try to import a module, how can I make it look in certain
>>> directories for them easily.
>>> Sincerely,
>>>Chris
>>> ___
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>>>
>>
>>  Hello Chris
>>
>> You can manage you path from within your script,
>>
>>  import sys
>> sys.path.append("/home/user/lib")
>>
>>  Or in bash you can edit your  $PYTHONPATH env variable
>>  echo $PYTHONPATH
>>
>>
>> --
>> Vince Spicer
>>
>>
>>  --
>> Sent from Ubuntu
>>
>>So doing it in cmd windows will permanently change it?
>>
>
>
> the first way with work for Window,  the second is for Linux or posix
> systems
>
>  Sorry I can't help with PYTHONPATH on windows.
>
> --
> Vince Spicer
>
>
>  --
> Sent from Ubuntu
>
>  I want a permanent change.
>

There is probably a Windows alternative to env variables and PYTHONPATH,
Google may help.


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Re: [Tutor] pythonpath

[Vince Spicer]

On Mon, Nov 1, 2010 at 4:00 PM, Vince Spicer  wrote:

>
>
> On Mon, Nov 1, 2010 at 3:58 PM, Chris King  wrote:
>
>>  On 11/1/2010 5:57 PM, Vince Spicer wrote:
>>
>>
>>
>> On Mon, Nov 1, 2010 at 3:54 PM, Chris King  wrote:
>>
>>>   On 11/1/2010 5:47 PM, Vince Spicer wrote:
>>>
>>>
>>>
>>> On Mon, Nov 1, 2010 at 3:41 PM, Chris King  wrote:
>>>
>>>>  Dear Tutors,
>>>>When I try to import a module, how can I make it look in certain
>>>> directories for them easily.
>>>> Sincerely,
>>>>Chris
>>>> ___
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>>>>
>>>
>>>  Hello Chris
>>>
>>> You can manage you path from within your script,
>>>
>>>  import sys
>>> sys.path.append("/home/user/lib")
>>>
>>>  Or in bash you can edit your  $PYTHONPATH env variable
>>>  echo $PYTHONPATH
>>>
>>>
>>> --
>>> Vince Spicer
>>>
>>>
>>>  --
>>> Sent from Ubuntu
>>>
>>>    So doing it in cmd windows will permanently change it?
>>>
>>
>>
>> the first way with work for Window,  the second is for Linux or posix
>> systems
>>
>>  Sorry I can't help with PYTHONPATH on windows.
>>
>> --
>> Vince Spicer
>>
>>
>>  --
>> Sent from Ubuntu
>>
>>  I want a permanent change.
>>
>
> There is probably a Windows alternative to env variables and PYTHONPATH,
> Google may help.
>
>
> --
> Vince Spicer
>
> --
> Sent from Ubuntu
>
>

Sorry I don't know any developers that run Windows anymore, if you find the
solution please post it back here.

Thanks.


-- 
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Re: [Tutor] if statement

[Vince Spicer]

On Tue, Nov 2, 2010 at 1:07 PM, Glen Clark  wrote:

> sorry:
>
> NumItems = int(input("How many Items: "))
>
>
> Entries = []
> for In in range(0,NumItems):
>   Entries.append("")
>
>
>
> for In in range(0,NumItems):
>   Entries[In]=str(input("Enter name " + str(In+1) + ": "))
>
>
> for In in range(0,NumItems):
>   print(Entries[In])
>
> confirmed = int(input("Are you happy with this? (y/n): ")
>
> if confirmed == "y":
>   for In in range(0,NumItems):
>  print(Entries[In] + ": " + str(In))
>   change = int(input("Which item would you like to change: ")
>   Entries[change]=str(input("Please enter a nem name: ")
> else:
>#do nothing
>
> print(Entries)
>
> On Tue, 2010-11-02 at 15:05 -0400, Alex Hall wrote:
> > On 11/2/10, Glen Clark  wrote:
> > >  File "/home/glen/workspace/test.py", line 19
> > > if confirmed == "y":
> > >^
> > > SyntaxError: invalid syntax
> > >
> > > Why does this not work??? PyDev says "Expected:else"
> > It may help to see the rest of the file, or at least more of the code
> > surrounding this statement.
> > >
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> >
> >
>
>
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confirmed = int(input("Are you happy with this? (y/n): ")

You are missing a ) that the end of this line to close the int

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Re: [Tutor] Add newline's, wrap, a long string

[vince spicer]

first, grabbing output from an external command try:

import commands

USE = commands.getoutput('grep USE /tmp/comprookie2000/emege_info.txt |head
-n1|cut -d\\"-f2')
then you can wrap strings,

import textwrap

Lines = textwrap.wrap(USE, 80) # return a list

so in short:

import commands, textwrap
data = textwrap.wrap(commands.getoutput('my command'), 80)



Vince





On Tue, Apr 28, 2009 at 3:43 PM, David  wrote:

> I am getting information from .txt files and posting them in fields on a
> web site. I need to break up single strings so they are around 80 characters
> then a new line because when I enter the info to the form on the website it
> has fields and it errors out with such a long string.
>
> here is a sample of the code;
>
> #!/usr/bin/python
> import subprocess
> import os
>
> u_e = subprocess.Popen(
> 'grep USE /tmp/comprookie2000/emerge_info.txt |head -n1|cut -d\\"-f2',
> shell=True, stdout=subprocess.PIPE,)
> os.waitpid(u_e.pid, 0)
> USE = u_e.stdout.read().strip()
> L = len(USE)
> print L
> print USE
>
> L returns 1337
>
> Here is what USE returns;
> http://linuxcrazy.pastebin.com/m2239816f
>
> thanks
> -david
> --
> Powered by Gentoo GNU/Linux
> http://linuxcrazy.com
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Re: [Tutor] Advanced String Search using operators AND, OR etc..

[vince spicer]

Advanced Strings searches are Regex via re module.

EX:

import re

m = re.compile("(FDA.*?(approved|supported)|Ben[^\s])*")

if m.search(Text):
print m.search(Text).group()


Vince


On Mon, May 4, 2009 at 6:45 AM, Alex Feddor  wrote:

> Hi
>
> I am looking for method enables advanced text string search. Method
> string.find() or re module seems no  supporting what I am looking for. The
> idea is as follows:
>
> Text ="FDA meeting was successful. New drug is approved for whole sale
> distribution!"
>
> I would like to scan the text using AND and OR operators and gets -1 or
> other value if the searching elements haven't found in the text.
> Example 01:
> search criteria:  "FDA" AND ( "approve*" OR "supported")
> The catch is that in Text variable FDA and approve words  are not one after
> another (other words are in between).
>  Example 02:
> search criteria: "Ben"
> The catch is that code sould find only exact Ben words not also words which
> that has firts three letters Ben such as Benquick, Benseek etc.. Only Ben is
> the right word we are looking for.
>
> I would really appreciated your advice - code sample / links how above can
> be achieved! if possible I would appreciated solution achieved with free of
> charge module.
>
> Cheers,  Alex
> PS:
> A few moths ago I have discovered Python. I am amazed what all can be done
> with it. Really cool programming language..
>
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Re: [Tutor] Sorting a list

[vince spicer]

you can pass sort a custom compare function


Simple ex:

def compare(x,y):
try:
return cmp(int(x), int(y))
except:
pass
try:
int(x)
except:
return -1
try:
int(y)
except:
return 1
return 0


x = [4, 6, 'word', 3, 9]
x.sort(cmp=compare)

>> ['word', 3,4, 6, 9]


On Wed, May 13, 2009 at 10:25 AM, Timo  wrote:

> Hello,
>
> I don't think this should be difficult, so maybe I look over it. But I
> can't seem to find the solution.
>
> I have a list with one word and a couple of numbers. Now I want the word to
> be kept in the first location and the numbers to be sorted.
>
> So this:
> [4, 6, 'word', 3, 9]
>
> should be:
>
> ['word', 3, 4, 6, 9]
>
> Timo
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Re: [Tutor] Python popen command using cat > textfile .... how to terminate

[vince spicer]

Take a peak at commands.getoutput


EX:

import commmands

ls = commands.getoutput("ls- ls")

Vince

On Thu, May 14, 2009 at 3:50 PM, MK  wrote:

> Hi there,
>
> i am using this code to send an "cat > ThisIsMyUrl" with popen.
> Of cos cat now waits for the CTRL+D command.
> How can i send this command ?
>
> def console_command(cmd):
>print cmd
>console = os.popen(cmd,"r")
>output = console.read()
>console.close()
>return output
>
> command="cat > " + working_dir + "/" + subdir + "www.thisismyurl.com"
> console_command(command)
>
>
> Thank you.
>
>
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Re: [Tutor] Python popen command using cat > textfile .... how to terminate

[vince spicer]

import commands

On Thu, May 14, 2009 at 4:28 PM, vince spicer  wrote:

> Take a peak at commands.getoutput
>
>
> EX:
>
> import commmands
>
> ls = commands.getoutput("ls- ls")
>
> Vince
>
>
> On Thu, May 14, 2009 at 3:50 PM, MK  wrote:
>
>> Hi there,
>>
>> i am using this code to send an "cat > ThisIsMyUrl" with popen.
>> Of cos cat now waits for the CTRL+D command.
>> How can i send this command ?
>>
>> def console_command(cmd):
>>print cmd
>>console = os.popen(cmd,"r")
>>output = console.read()
>>console.close()
>>return output
>>
>> command="cat > " + working_dir + "/" + subdir + "www.thisismyurl.com"
>> console_command(command)
>>
>>
>> Thank you.
>>
>>
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Re: [Tutor] Allow only one instance of a process

[Vince Spicer]

simple solution would be to create a lock file before processing, 

lock = open("videoname.lck")
lock.close()





On Saturday 16 May 2009 8:26:31 pm Sylvain Ste-Marie wrote:
> I'm currently writing a script to batch convert video for my psp
>
> It basically looks into a folder for video and launch ffmpeg:
>
> ffmpeg -i "videoname" -f psp -r 29.97 -b 768k -ar 24000 -ab 64k -s
> 368x208 "videoname.mp4"
>
> my idea is basically to check for pid but how do i do that?
>
>
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Re: [Tutor] web cam

[vince spicer]

I've seen this win32 library:

http://videocapture.sourceforge.net via
http://technobabbler.com?p=22

for linux

http://www.antonym.org/libfg

Vince

2009/5/20 Ricardo Aráoz 

> Hi, a friend of mine has asked me how difficult would it be to send web
> cam images through python program as a hobby project.
> Honestly, at this point I have no idea where does he want to put python
> in the equation nor what does the project entail. So I'm asking for
> pointers to :
> a) Any already done projects in python
> b) keywords to google for
> c) what parts do you think I'll need to put together (web service,
> client, browser) and which modules do you recommend.
>
> I know this is a half baked question, just some pointers on where to
> start from would be enough.
>
> Thanks
>
>
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Re: [Tutor] how to get variable from an external script or program

[vince spicer]

import commands
output = commands.getout("ls -lah")

Vince

On Fri, May 29, 2009 at 3:27 PM, shawn bright  wrote:

> Hey all
>
> I have a small program that when run from the command line, will
> return a certain value for an arguement. Like this:
>
> > mfetchz 45
> > 45j
>
> so the program is mfetchz and the argument is 45
>
> i know i can call the program with os.system("mfetchz 45")
> but how do i get the return?
>
> The OS is linux, if that matters
>
> thanks
>
> sk
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Re: [Tutor] how to get variable from an external script or program

[vince spicer]

Sorry *output

import commands
> output = commands.getoutput("ls -lah")



> Vince
>
>
> On Fri, May 29, 2009 at 3:27 PM, shawn bright  wrote:
>
>> Hey all
>>
>> I have a small program that when run from the command line, will
>> return a certain value for an arguement. Like this:
>>
>> > mfetchz 45
>> > 45j
>>
>> so the program is mfetchz and the argument is 45
>>
>> i know i can call the program with os.system("mfetchz 45")
>> but how do i get the return?
>>
>> The OS is linux, if that matters
>>
>> thanks
>>
>> sk
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Re: [Tutor] How o convert spaces into tabs??

[vince spicer]

regex will do it


import re

line = re.sub(r"\s+", "\t", line)

print line



Vince

On Tue, Jun 2, 2009 at 11:42 AM, jyotsna guleria
wrote:

>
> Hello every one,
>
> I am trying to parse a file:
>
> I want to convert all the spaces in between the characters to single tab.
>
> e.g: my file has contents like:
>
> 1G579011  10  2   0  00
> 0   0   00
> 5Ht-2  60459  11  0   0  00
> 0   0   00
>
>
> I want them to be separated by a single tab not with spaces..
>
> It should look like:
>
> 1G5790111020000000
> 5Ht-2604591100000000
>
> each separated by Tab...
>
> It is a text file containing such a data ..
>
>
> Thanks
> --
> Jyotsna Guleria
>
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Re: [Tutor] improvement of if - else code

[vince spicer]

you could assign loop variable

   @staticmethod
   def get_form(address=None, postcode=None, town=None, phone=None,
fax=None,
freephone=None, address_country=None, address_region=None,
address_county=None, hotel=None):
   context = get_context()
   root = context.root
   # List authorized countries

   loopvar = root.get_active_countries(context) if hotel else
root.get_authorized_countries(context)

   countries = [ {'name': y, 'title': x, 'selected': y ==
address_country} for x, y in loopvar ]




On Thu, Jun 4, 2009 at 11:25 AM, Norman Khine  wrote:

> Hello,
> Is there a better way to write this:
>
>@staticmethod
>def get_form(address=None, postcode=None, town=None, phone=None,
> fax=None,
> freephone=None, address_country=None, address_region=None,
> address_county=None, hotel=None):
>context = get_context()
>root = context.root
># List authorized countries
>if hotel is True:
>countries = [
>{'name': y, 'title': x, 'selected': y == address_country}
>for x, y in root.get_active_countries(context) ]
>else:
>countries = [
>{'name': y, 'title': x, 'selected': y == address_country}
>for x, y in root.get_authorized_countries(context) ]
>
> Thanks
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Re: [Tutor] Simple factorial program

[vince spicer]

did you declare factorial before trying to use it?

factorial = 1
print "Factorial finder"
number = int(input("Please enter a non-negative integer: "))
for number in range(number, 1)
factorial = (factorial * number)

print "Factorial:", factorial

On Thu, Jun 11, 2009 at 9:53 AM, Eddie  wrote:

> I'm trying to write a simple factorial program and am unsure at what is
> wrong with it. Why Can't I go *factorial = factorial * number* where
> factorial and number are both integers?
>
> #Factorial program
>
> print "Factorial finder"
> number = input("Please enter a non-negative integer: "
> for number in range(number, 1)
> factorial = (factorial * number)
>
> print "Factorial:", factorial
>
> Thanks Eddie [?]
>
>
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Re: [Tutor] Simple factorial program

[vince spicer]

no ":" after for statement

Vince

On Thu, Jun 11, 2009 at 10:06 AM, Eddie  wrote:

> Thanks, that is my problem.
>
> With that code, why is it giving an error  (indenting?) at the end of* for
> number in range(number, 1) *?
>
> 2009/6/12 vince spicer 
>
> did you declare factorial before trying to use it?
>>
>> factorial = 1
>> print "Factorial finder"
>> number = int(input("Please enter a non-negative integer: "))
>> for number in range(number, 1)
>> factorial = (factorial * number)
>>
>> print "Factorial:", factorial
>>
>> On Thu, Jun 11, 2009 at 9:53 AM, Eddie  wrote:
>>
>>> I'm trying to write a simple factorial program and am unsure at what is
>>> wrong with it. Why Can't I go *factorial = factorial * number* where
>>> factorial and number are both integers?
>>>
>>> #Factorial program
>>>
>>> print "Factorial finder"
>>> number = input("Please enter a non-negative integer: "
>>> for number in range(number, 1)
>>> factorial = (factorial * number)
>>>
>>> print "Factorial:", factorial
>>>
>>> Thanks Eddie [?]
>>>
>>>
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Re: [Tutor] New to programming and python first minimilistic program (Bottles of beer), , please comment!

[vince spicer]

Like in any language there any number for ways, heres another

b = "bottles of beer"
w = "on the wall"
bottles = range(1, 101)
bottles.reverse()
for bottle in bottles:
print " %s %s %s if one of those bottles should happen to fall there'll
be %s %s %s" % (bottle, b,w, bottle-1, b,w)

Vince

2009/6/17 matthew andriani 

>  Hi Guys,
>
> I wrote this program for some practice to get into python..I'm trying to
> find fun ways to learn the language so if anyone has a challenge on this
> basic level using loops that sounds exciting please let me know.. If you
> think this program can be improved please let me know too :)
>
> b = "bottles of beer"
> w = "on the wall"
> a = 100
> while a != 0:
> a = a-1
> print a,b,w,a,b,"if one of those bottles should happen to fall there'll
> be",a-1,b,w
>
>
> Thanks for the feedback..
>
> Cheers,
> Skellem.
>
>
>
> --
> What can you do with the new Windows Live? Find 
> out
>
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Re: [Tutor] Handling Generator exceptions in Python 2.5

[vince spicer]

Well*

*result = [(ListA[i] - ListB[i-1])/ListA[i] for i in range(len(ListA))*if
not ListA[i] == 0*]

will exclude any results where listA[i] is 0, if you still want these in the
result
you may want to use good'ol for statement instead of list comprehension


results = []
for x in range(len(listA)):
y = ListA[i] - ListB[i-1]
if not ListA[i] == 0:
y = y / ListA[i]
results.append(y)

print results

Vince


On Fri, Jun 19, 2009 at 8:55 AM, Joe Python  wrote:

> I have a generator as follows to do list calculations.
>
> *result = [(ListA[i] - ListB[i-1])/ListA[i] for i in range(len(ListA))]*
>
> The above generator, throws  '*ZeroDivisionError*' exception if ListA[i] =
> 0.
> Is there a way to say 'Don't divide by ListA[i] if its equal to 0 (within
> that statement)'.
>
> Sorry if this question sounds too stupid.
>
> TIA
> Joe
>
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Re: [Tutor] extracting lines in large file

[vince spicer]

14mb file shouldn't be an issue, unless you very little ram, is there any
errors being outputted?

a cleaner way for reading the file:

for line in open("output.new"):
if line.startswith("intrinsic"):
print line


On Mon, Jun 22, 2009 at 2:16 PM, Bryan Fodness wrote:

> I am trying to output all the lines that start with a specific word.
> It is a large output file (~14 Mb), but nothing that I thought would
> be a problem.
>
> for line in open('output.new'):
>i_line = line.split()
>if i_line:
>if i_line[0] == "intrinsic":
>print i_line
>
> It does not get all of the lines, it stops at line 130323.  There are
> ~26 line.  Is there a limit to the number of lines you can read in
> this way, or am I overlooking something else.
>
> Bryan
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Re: [Tutor] extracting lines in large file

[Vince Spicer]

are there any extra spaces of characters

" intrinsic" !== "intrinsic"

On Monday 22 June 2009 8:14:00 pm Bryan Fodness wrote:
> tried both again, they both return the same 9 lines, when i expect
> 492.  it dies on a blank line, but the if i_line takes care of the
> previous ones.
>
> On Mon, Jun 22, 2009 at 4:21 PM, vince spicer wrote:
> > 14mb file shouldn't be an issue, unless you very little ram, is there any
> > errors being outputted?
> >
> > a cleaner way for reading the file:
> >
> > for line in open("output.new"):
> > if line.startswith("intrinsic"):
> > print line
> >
> >
> > On Mon, Jun 22, 2009 at 2:16 PM, Bryan Fodness 
> >
> > wrote:
> >> I am trying to output all the lines that start with a specific word.
> >> It is a large output file (~14 Mb), but nothing that I thought would
> >> be a problem.
> >>
> >> for line in open('output.new'):
> >>i_line = line.split()
> >>if i_line:
> >>if i_line[0] == "intrinsic":
> >>print i_line
> >>
> >> It does not get all of the lines, it stops at line 130323.  There are
> >> ~26 line.  Is there a limit to the number of lines you can read in
> >> this way, or am I overlooking something else.
> >>
> >> Bryan
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Re: [Tutor] Trouble with passing commands / variables to os.system()

[vince spicer]

os.system is not the best way to handle this you may want to look into
the subprocess module

however:

import os

username = 'charlie'
private_key = '/path/to/key'
ssh = '/usr/bin/ssh'
command = 'hostname && df -h && exit'

servers = ['172.16.1.1', '172.16.12.2', '172.16.1.3']

for host in servers:
os.system("ssh %...@%s -i %s %s" %(username, host, private_key, command)



On Tue, Jun 23, 2009 at 2:01 PM, Charlie Reddington <
charlie.redding...@gmail.com> wrote:

> Hi,
>
> I'm very very green when it comes to python. I know bash better than
> python, so I figured a good way to learn things was covert my bash stuff to
> python. So here goes...
>
> Here's a quick example of the code I have that is broken.
>
> import os
>
> username = 'charlie'
> private_key = '/path/to/key'
> ssh = '/usr/bin/ssh'
> command = 'hostname && df -h && exit'
>
> servers = ['172.16.1.1', '172.16.12.2', '172.16.1.3']
>
> for host in servers:
>print(os.system(ssh -l username -i private_key host command))
>
> What I'm trying to do is is, is use ssh with a private key. That way I can
> quickly run some remote commands on a few hundred servers in a quick way to
> do stuff (disk usage, top, etc).
>
> When I run this, I get errors like this for every host in my list.
>
> Warning: Identity file private_key not accessible: No such file or
> directory.
> ssh: Could not resolve hostname i: nodename nor servname provided, or not
> known
> 65280
>
> My first thoughts are, it's not passing my variables to the function the
> way I'd expect.
>
> So my questions are...
>
> 1.) Is it nessacary to put my IP's in quotes?
> 2.) When I call a variable in a function (like os.system() or print()) I
> don't use $'s right?
> 3.) Am I putting variables in my functions properly? Can I put variables
> like this in there?
>
> Thanks for any help.
>
> Charlie
>
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Re: [Tutor] string pickling and sqlite blob'ing

[vince spicer]

Pickle is more for storing complex objects (arrays, dict, etc). pickling a
string makes it bigger.

I have stored large text chunks in text and/or blob columns compressed with
gzip.zlib.compress and extracted with gzip.zlib.decompress

Comparison:

import cPickle as Pickle
import gzip

x = "asdfasdfasdfasdfasdfasdfasdfasdfasdf"

print len(x)
>> 36

print len(Pickle.dumps(x))
>> 44

print len(gzip.zlib.compress(x))
>> 14


Vince

On Wed, Jun 24, 2009 at 11:17 AM, Dinesh B Vadhia  wrote:

>  I want to pickle (very long) strings and save them in a sqlite db.  The
> plan is to use pickle dumps() to turn a string into a pickle object and
> store it in sqlite.  After reading the string back from the sqlite db, use
> pickle loads() to turn back into original string.
>
> - Is this a good approach for storing very long strings?
>
> - Are the pickle'd strings stored in the sqlite db as a STRING or BLOB?
>
> Cheers.
>
> Dinesh
>
>
>
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Re: [Tutor] string pickling and sqlite blob'ing

[vince spicer]

Dinesh

In theory you can store in either type(i have done it), however you should
store in the binary column, blob

Vince



On Wed, Jun 24, 2009 at 2:42 PM, Dinesh B Vadhia
wrote:

>  Hi Vince
>
> That's terrific!  Once a string is compressed with gzip.zlib does it make a
> difference whether it is stored it in a TEXT or BLOB column?
>
> Dinesh
>
>
>
> *From:* vince spicer 
> *Sent:* Wednesday, June 24, 2009 10:49 AM
> *To:* Dinesh B Vadhia 
> *Cc:* tutor@python.org
> *Subject:* Re: [Tutor] string pickling and sqlite blob'ing
>
> Pickle is more for storing complex objects (arrays, dict, etc). pickling a
> string makes it bigger.
>
> I have stored large text chunks in text and/or blob columns compressed with
> gzip.zlib.compress and extracted with gzip.zlib.decompress
>
> Comparison:
>
> import cPickle as Pickle
> import gzip
>
> x = "asdfasdfasdfasdfasdfasdfasdfasdfasdf"
>
> print len(x)
> >> 36
>
> print len(Pickle.dumps(x))
> >> 44
>
> print len(gzip.zlib.compress(x))
> >> 14
>
>
> Vince
>
> On Wed, Jun 24, 2009 at 11:17 AM, Dinesh B Vadhia <
> dineshbvad...@hotmail.com> wrote:
> I want to pickle (very long) strings and save them in a sqlite db.  The
> plan is to use pickle dumps() to turn a string into a pickle object and
> store it in sqlite.  After reading the string back from the sqlite db, use
> pickle loads() to turn back into original string.
>
> - Is this a good approach for storing very long strings?
>
> - Are the pickle'd strings stored in the sqlite db as a STRING or BLOB?
>
> Cheers.
>
> Dinesh
>
>
>
>>
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Re: [Tutor] How to pass command line variables to this python code...

[vince spicer]

First off, selenium is a great tool and the python driver is very powerful

there are numerous ways to access cli variables,

the quickest

import sys
print sys.srgv

sys.argv will it output a array of all command line args

./selenium-google-test.py yankees
will out put:

['selenium-google-test.py', 'yankees']

so

args = sys.argv

args[0] == 'yankees'
True

for a more functional way, check out
http://docs.python.org/library/getopt.html



On Tue, Jul 14, 2009 at 11:11 AM, J Cook  wrote:

> Hello,
>
> I have some autogenerated code from Selenium which I cannot figure out how
> to pass some command line variables to. For example I could export the same
> in Perl and it would be for example:
>
> 
> use strict;
> use warnings;
> use Time::HiRes qw(sleep);
> use Test::WWW::Selenium;
> use Test::More "no_plan";
> use Test::Exception;
>
> my $sel = Test::WWW::Selenium->new( host => "localhost",
>port => ,
>browser => "*chrome",
>browser_url =>   "
> http://www.google.com/"; );
>
> $sel->open_ok("/");
> $sel->type_ok("q", "red sox");
> 
>
> I could then go in and add something like:
>
> my ($arg1) = shift || "default";
>
> which would pick up the first command line parameter and then I could do
> something like:
>
> $sel->(type_ok, $arg1);
>
> All is good here, now Selenium will export the following for Python:
>
> 
> from selenium import selenium
> import unittest, time, re
>
> class NewTest(unittest.TestCase):
>def setUp(self):
>self.verificationErrors = []
>self.selenium = selenium("localhost", , "*chrome", "
> http://www.google.com/";)
>self.selenium.start()
>
>def test_new(self):
>sel = self.selenium
>sel.open("/")
>sel.type("q", "red sox")
>
>def tearDown(self):
>self.selenium.stop()
>self.assertEqual([], self.verificationErrors)
>
> if __name__ == "__main__":
>unittest.main()
> 
>
> Now I am confused on how to pass a command line parameter here. Any
> suggestions? I would like to be able to run something like:
>
> $ python selenium-google-test.py "yankees"
>
> Suggestions?
>
>
> TIA
>
> Justin
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Re: [Tutor] How to pass command line variables to this python code...

[vince spicer]

Sorry I do remember that issue in the past, the unittest.main takes over the
cli variables in order to select modules to run

python selenium-google-test.py --help

so unittest is assuming yankees is a test module, you can override this
functionality however with:

unittest.main(argv=['mytestapp'])

this will cause the default run all test modules, and allow you to access
the argv

Hope that helps

Vince



On Tue, Jul 14, 2009 at 1:36 PM, J Cook  wrote:

> Ok,
>
> So I added the following:
>
> 
> from selenium import selenium
> import unittest, time, re
> import sys # added this
>
> q = sys.argv[1] # added this
> print q # added this just to see
>
> class NewTest(unittest.TestCase):
>def setUp(self):
>self.verificationErrors = []
>self.selenium = selenium("localhost", , "*chrome", "
> http://www.google.com/";)
>self.selenium.start()
>
>def test_new(self):
>sel = self.selenium
>sel.open("/")
>sel.type("q", q) # this is where I want the argument to end up
>
>def tearDown(self):
>self.selenium.stop()
>self.assertEqual([], self.verificationErrors)
>
> if __name__ == "__main__":
>unittest.main()
> 
>
> I run the following:
>
> $ python selenium-google-test.py yankees
> yankees
> Traceback (most recent call last):
>  File "selenium-google-test.py", line 24, in 
>unittest.main()
>  File "/usr/lib/python2.6/unittest.py", line 816, in __init__
>self.parseArgs(argv)
>  File "/usr/lib/python2.6/unittest.py", line 843, in parseArgs
>self.createTests()
>  File "/usr/lib/python2.6/unittest.py", line 849, in createTests
>self.module)
>  File "/usr/lib/python2.6/unittest.py", line 613, in loadTestsFromNames
>suites = [self.loadTestsFromName(name, module) for name in names]
>  File "/usr/lib/python2.6/unittest.py", line 584, in loadTestsFromName
>parent, obj = obj, getattr(obj, part)
> AttributeError: 'module' object has no attribute 'yankees'
>
> How do I get the argument over to where I need it to be?
>
> Justin
>
> vince spicer wrote:
>
>> First off, selenium is a great tool and the python driver is very powerful
>>
>> there are numerous ways to access cli variables,
>>
>> the quickest
>>
>> import sys
>> print sys.srgv
>>
>> sys.argv will it output a array of all command line args
>>
>> ./selenium-google-test.py yankees
>> will out put:
>>
>> ['selenium-google-test.py', 'yankees']
>>
>> so
>>
>> args = sys.argv
>>
>> args[0] == 'yankees'
>> True
>>
>> for a more functional way, check out
>> http://docs.python.org/library/getopt.html
>>
>>
>>
>> On Tue, Jul 14, 2009 at 11:11 AM, J Cook > jcook...@gmail.com>> wrote:
>>
>>Hello,
>>
>>I have some autogenerated code from Selenium which I cannot figure
>>out how to pass some command line variables to. For example I could
>>export the same in Perl and it would be for example:
>>
>>
>>use strict;
>>use warnings;
>>use Time::HiRes qw(sleep);
>>use Test::WWW::Selenium;
>>use Test::More "no_plan";
>>use Test::Exception;
>>
>>my $sel = Test::WWW::Selenium->new( host => "localhost",
>>   port => ,
>>   browser => "*chrome",
>>   browser_url =>  "
>> http://www.google.com/"; );
>>
>>$sel->open_ok("/");
>>$sel->type_ok("q", "red sox");
>>
>>
>>I could then go in and add something like:
>>
>>my ($arg1) = shift || "default";
>>
>>which would pick up the first command line parameter and then I
>>could do something like:
>>
>>$sel->(type_ok, $arg1);
>>
>>All is good here, now Selenium will export the following for Python:
>>
>>
>>from selenium import selenium
>>import unittest, time, re
>>
>>class NewTest(unittest.TestCase):
>>   def setUp(self):
>>   self.verificationErrors = []
>>   self.selenium = selenium("localhost", , "*chrome",
>>"http://www.google.com/";)
>>   self.selenium.start()
>>
>>   def test_new(self):
>>   sel = self.selenium
>>   sel.open("/")
>>   sel.type("q", "red sox")
>>
>>   def tearDown(self):
>>   self.selenium.stop()
>>   self.assertEqual([], self.verificationErrors)
>>
>>if __name__ == "__main__":
>>   unittest.main()
>>
>>
>>Now I am confused on how to pass a command line parameter here. Any
>>suggestions? I would like to be able to run something like:
>>
>>$ python selenium-google-test.py "yankees"
>>
>>Suggestions?
>>
>>
>>TIA
>>
>>Justin
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Re: [Tutor] How to pass command line variables to this python code...

[vince spicer]

good catch, my mistake

args[1] == 'yankees'
True


On Wed, Jul 15, 2009 at 12:25 AM, Christian Witts wrote:

> vince spicer wrote:
>
>> First off, selenium is a great tool and the python driver is very powerful
>>
>> there are numerous ways to access cli variables,
>>
>> the quickest
>>
>> import sys
>> print sys.srgv
>>
>> sys.argv will it output a array of all command line args
>>
>> ./selenium-google-test.py yankees
>> will out put:
>>
>> ['selenium-google-test.py', 'yankees']
>>
>> so
>>
>> args = sys.argv
>>
>> args[0] == 'yankees'
>> True
>>
> That would be false, the first argument (list index zero) is the script
> name.  You would need to do
> args = sys.argv[1:]
> if you want to dump the filename from the list.
>
> --
> Kind Regards,
> Christian Witts
>
>
>
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Re: [Tutor] decorators, __call__ (able) objects

[vince spicer]

simple example of calling a class


class myKlass(object):



On Wed, Jul 15, 2009 at 6:33 AM, Kent Johnson  wrote:

> On Wed, Jul 15, 2009 at 7:41 AM, Todd Matsumoto wrote:
> > Hi,
> >
> > Can some one give, or point to some good examples of how @decorators
> work, and __call__ (able) objects?
>
> Decorators:
> http://personalpages.tds.net/~kent37/kk/1.html
>
> Kent
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Re: [Tutor] decorators, __call__ (able) objects

[vince spicer]

simple example of calling a class

class myKlass(object):

def __call__(self, *args, **kws):
 print "i was called"


>> test = myKlass()

>> test()

>> i was called


>
>
>
> On Wed, Jul 15, 2009 at 6:33 AM, Kent Johnson  wrote:
>
>> On Wed, Jul 15, 2009 at 7:41 AM, Todd Matsumoto
>> wrote:
>> > Hi,
>> >
>> > Can some one give, or point to some good examples of how @decorators
>> work, and __call__ (able) objects?
>>
>> Decorators:
>> http://personalpages.tds.net/~kent37/kk/1.html
>>
>> Kent
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Re: [Tutor] just one question

[vince spicer]

one way is:

import re

infile = open("test.txt", "r") #: open read mode
outfile = open("out.tx", "w") #: open write mode

for line in infile:
values = re.split("\s+", line) # split values on spaces EX: ['47', '8',
'ALA', 'H', 'H', '7.85', '0.02', '1']
outfile.write("%s  %s C =  %s  CA =  %s CB = %s" % (values[1],
values[2], values[5], values[6], values[7]))

infile.close()
outfile.close()

not tested but should work

Vince

On Wed, Jul 15, 2009 at 6:24 AM,  wrote:

> Hi,
>
> i want to ask one thing that suppose i have a .txt file having content
> like:---
>
>
>  47 8   ALA   H H  7.85 0.02 1
>  48 8   ALA   HAH  2.98 0.02 1
>  49 8   ALA   HBH  1.05 0.02 1
>  50 8   ALA   C C179.39  0.3 1
>  51 8   ALA   CAC 54.67  0.3 1
>  52 8   ALA   CBC 18.85  0.3 1
>  53 8   ALA   N N123.95  0.3 1
> 10715   ALA   H H  8.05 0.02 1
> 10815   ALA   HAH  4.52 0.02 1
> 10915   ALA   HBH  1.29 0.02 1
> 11015   ALA   C C177.18  0.3 1
> 11115   ALA   CAC 52.18  0.3 1
> 11215   ALA   CBC 20.64  0.3 1
> 11315   ALA   N N119.31  0.3 1
> 15421   ALA   H H  7.66 0.02 1
> 15521   ALA   HAH  4.05 0.02 1
> 15621   ALA   HBH  1.39 0.02 1
> 15721   ALA   C C179.35  0.3 1
> 15821   ALA   CAC 54.33  0.3 1
>
> now what i want that i will make another .txt file in which first it will
> write the position of ALA lets say 8, 15, 21 then its name ALA and then
> the fifth column value for only three atoms C,CA and CB.
>
> Means it will be someting like:
>
> 8  ALA  C = 179.39  CA = 54.67  CB = 18.85
> 15 ALA  C = 177.18  CA = 52.18  CB = 20.64
> 21 ALA  C = 179.35  CA = 54.33  CB =
>
> if some value is not there then it will leave that as blank.I am new in
> python but this is what we want, so how can i do it using python script.
>
>
>
>
>
> Amrita Kumari
> Research Fellow
> IISER Mohali
> Chandigarh
> INDIA
>
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Re: [Tutor] objects becoming pointers

[vince spicer]

not sure exactly why you would want to that, but you could assign attributes
to a class

EX:

class storage:
pass

>> store = Storage()
>> name=raw_input()

>> setattr(store, name, zeros(3,3))

>> print store.Chris


On Wed, Jul 15, 2009 at 9:19 AM, chris Hynes  wrote:

>  I guess I have to start somewhere to ask
>
> I want the user to input a name, say "Chris". I know I can use the code:
>
> name=raw_input()
>
> I now want:
>
> "Chris"=zeros((3,3))
>
> so that when I type:
>
> print Chris
>
> the return will be an array of zero's 3x3
>
> So that I can understand this deeper, I know that "name" is just a pointer
> to the object "Chris". I don't want to just change the pointer to something
> else, like "zeros((3,3))" but I want to make "Chris" become the pointer or
> the name of the pointer. At least that's what I think I want.
>
> --
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>
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Re: [Tutor] decorators, __call__ (able) objects

[vince spicer]

agreed much better description, thanks

On Wed, Jul 15, 2009 at 1:02 PM, wesley chun  wrote:

> >>> > Can some one give, or point to some good examples of how @decorators
> >>> > work, and __call__ (able) objects?
> >
> > simple example of calling a class
> >
> > class myKlass(object):
> >
> > def __call__(self, *args, **kws):
> >  print "i was called"
> >
> > >>> test = myKlass()
> > >>> test()
> > i was called
>
>
> close. the example was right, but the description wasn't accurate...
> you meant, "calling an instance." i'm going to plagarize and rip this
> right out of section 14.1.4 from "Core Python Programming:"
>
> "Python provides the __call__() special method for classes, which allows a
> programmer to create objects (instances) that are callable. By default, the
> __call__() method is not implemented, meaning that most instances are
> not callable. However, if this method is overridden in a class definition,
> instances of such a class are made callable. Calling such instance objects
> is
> equivalent to invoking the __call__() method. Naturally, any arguments
> given in the instance call are passed as arguments to __call__()."
>
> as far as decorators go, kent's tutorial is great place to start. here
> are 2 more articles plus PEP 318, where they were defined:
>
> http://www.ibm.com/developerworks/linux/library/l-cpdecor.html
> http://www.artima.com/weblogs/viewpost.jsp?thread=240808
> http://www.python.org/dev/peps/pep-0318
>
> in addition, i devoted section 11.3.6 of Core Python to decorators.
>
> finally, it should be mentioned that starting in 2.6, you can now
> decorate *classes*, as seen here in PEP 3129:
>
> http://www.python.org/dev/peps/pep-3129/
>
> hope this helps!
> -- wesley
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> "Core Python Programming", Prentice Hall, (c)2007,2001
> "Python Fundamentals", Prentice Hall, (c)2009
>http://corepython.com
>
> wesley.j.chun :: wescpy-at-gmail.com
> python training and technical consulting
> cyberweb.consulting : silicon valley, ca
> http://cyberwebconsulting.com
>
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Re: [Tutor] decorators, __call__ (able) objects

[Vince Spicer]

no the __call__ function can is like any function

def __call__(self, passedin):

or simply 

def __call__(self)


*args and **kws explained >  http://www.saltycrane.com/blog/2008/01/how-to-
use-args-and-kwargs-in-python/

On Thursday 16 July 2009 12:09:52 am Todd Matsumoto wrote:
> Thanks guys,
>
> In the example the __call__ method has *args and **kws as arguments. Is
> that required?
>
> Also when, in what situation would you use callable objects?
>
> Cheers,
>
> T
>  Original-Nachricht 
>
> > Datum: Wed, 15 Jul 2009 12:02:05 -0700
> > Von: wesley chun 
> > An: vince spicer , tmatsum...@gmx.net
> > CC: Kent Johnson , tutor@python.org
> > Betreff: Re: [Tutor] decorators, __call__ (able) objects
> >
> > >>> > Can some one give, or point to some good examples of how
> > >>> > @decorators work, and __call__ (able) objects?
> > >
> > > simple example of calling a class
> > >
> > > class myKlass(object):
> > >
> > > def __call__(self, *args, **kws):
> > >  print "i was called"
> > >
> > > >>> test = myKlass()
> > > >>> test()
> > >
> > > i was called
> >
> > close. the example was right, but the description wasn't accurate...
> > you meant, "calling an instance." i'm going to plagarize and rip this
> > right out of section 14.1.4 from "Core Python Programming:"
> >
> > "Python provides the __call__() special method for classes, which allows
> > a programmer to create objects (instances) that are callable. By default,
> > the
> > __call__() method is not implemented, meaning that most instances are
> > not callable. However, if this method is overridden in a class
> > definition,
> > instances of such a class are made callable. Calling such instance
> > objects is
> > equivalent to invoking the __call__() method. Naturally, any arguments
> > given in the instance call are passed as arguments to __call__()."
> >
> > as far as decorators go, kent's tutorial is great place to start. here
> > are 2 more articles plus PEP 318, where they were defined:
> >
> > http://www.ibm.com/developerworks/linux/library/l-cpdecor.html
> > http://www.artima.com/weblogs/viewpost.jsp?thread=240808
> > http://www.python.org/dev/peps/pep-0318
> >
> > in addition, i devoted section 11.3.6 of Core Python to decorators.
> >
> > finally, it should be mentioned that starting in 2.6, you can now
> > decorate *classes*, as seen here in PEP 3129:
> >
> > http://www.python.org/dev/peps/pep-3129/
> >
> > hope this helps!
> > -- wesley
> > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> > "Core Python Programming", Prentice Hall, (c)2007,2001
> > "Python Fundamentals", Prentice Hall, (c)2009
> > http://corepython.com
> >
> > wesley.j.chun :: wescpy-at-gmail.com
> > python training and technical consulting
> > cyberweb.consulting : silicon valley, ca
> > http://cyberwebconsulting.com
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Re: [Tutor] dictionaries help

[vince spicer]

this should work


def find_value(value, lst):
for obj in lst:
if value in obj.values():
return obj

>> find_value("aaa", my_lst)

Vince

On Thu, Jul 23, 2009 at 9:55 AM,  wrote:

> hello,
> please excuse me, but i would like to understand how dictionaris work.
>
> for example:
> >>> my_lst = [{'code': 'aaa', 'name': 'a name'}, {'code': 'bbb', 'name': 'b
> name'}]
> >>> my_code = 'aaa'
>
>
> from the above i would like to compare my_code and return the dictionary
> which has code == my_code
>
> dave
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Re: [Tutor] traversing page and then following the link

[vince spicer]

there are many ways to parse html pages and retrieve data, I tend to use
lxml and xpath to simplify things and urllib to pull down the data

lxml is not a core library but can be installed via easy_install, the main
benefit is the xpath support

=
import urllib2
from lxml import html as HTML

useragent = "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.1)
Gecko/20090716 Ubuntu/9.04 (jaunty) Shiretoko/3.5.1"

opener = urllib2.build_opener()

main_page = urllib2.Request("
http://en.wikipedia.org/wiki/Gallery_of_sovereign-state_flags";)
main_page.headers["User-Agent"] = useragent #: wikipedia will return a 403
otherwise

html = HTML.fromstring(opener.open(main_page).read())

images = html.xpath("//a...@class='image']/img") #: parse all image tags

for img in images:
url = img.attrib["src"].split("/")
url.pop(url.index("thumb")) #: remove reference to thumb folder

local = open(url[-2], "wb") #: open local file

url = "/".join(url[:-1]) #: cleanup the .png reference

print "Downloading %s" % url

imgreq = urllib2.Request(url)
imgreq.headers["User-Agent"] = useragent

local.write(opener.open(imgreq).read()) #: read the remote svg file into
local file
local.close()



On Fri, Jul 24, 2009 at 8:48 AM,  wrote:

> Hello,
> I would like to download all the flags from the
> http://en.wikipedia.org/wiki/Gallery_of_sovereign-state_flags so that I
> can create a flags sprite from this.
>
> The flags seem to follow some order in that all the svg files are in the
> following pattern:
>
> http://en.wikipedia.org/wiki/File:Flag_of_*.svg and then on this page
> there is the link of the file.
>
> I have looked at using Twill to follow each link and record the actual url,
> but can somone point me at a simpler solution.
>
> Dave
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Re: [Tutor] Help with multiple substitution

[vince spicer]

not perfect or tested but

import re

chopset.reverse() #: put the longer extensions first

exts = "|".join([re.escape(x) fro x in chopset)])

for line in file:
print exts.sub("", line)



On Fri, Jul 24, 2009 at 9:22 AM, vankayala sailakshman <
sailakshm...@hotmail.com> wrote:

>
> Hi All,
>
> Help needed to write a python script!!!
>
> Iam a python newbie and my problem is doing multiple substitution in a text
> file using Python regular expressions. Here is my following data, I need to
> chop of all the extensions that are given in the following list and replace
> with empty string in their position. I have tried to solve for the past two
> days but couldn't succeed. Any help would be appreciated. Thanks in advance.
>
> Sai
>
>
>  for example, for “abc22035.pr.1” i need to get “abc22035”
>
>
>  chopset = ['.p', '.pr', '.prp', '.prpp', '.ps', '.psp', '.pspp', '.s',
> '.p.1','.pr.1', '.prp.1', '.prpp.1', '.ps.1', '.psp.1','.pspp.1', '.s.1']
>
>
>  abc22035.pr
>
> abc22035.pr.1 abc21409 .ps.1
>
> abc21409.pr.1 abc21154
>
> abc21154.pr.1 abc07584_EAOEA
>
> abc07584_EAOEA.ps.1 abc20991.pr
>
> abc20991.ps. abc21156
>
> abc21156.ps.1 abc21409
>
> abc21409.ps. abc21156
>
> abc21156.pr.1 abc21408
>
> abc21408.ps.1 abc21370.psp
>
> abc21370.pr.1 abc21370
>
> abc21370.ps.1 abc22036
>
> abc22036.pr.1 abc21154
>
> abc21154.ps.1 abc22036.prpp
>
> abc22036.ps.1 abc20991
>
> abc20991.pr.1 abc21772
>
> abc21772.pr.1 abc21408
>
> abc21408.pr.1 abc07584_EAOEA
>
> abc07584_EAOEA.pr.1 abc21065
>
>
>
> --
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> it!
>
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Re: [Tutor] Reading text until a certain point

[vince spicer]

you can build a dictionary and keep the active key, again this would only
work in predictable data

users = {}
name = None

for line in file:
key, value = [x.strip() for x in line.split(":")]
if key == "name":
name = data[1]
users[name] = {}
 else:
 users[name][data[0]]

>> users
{"stefan": {
  "id":12345
  "color":blue
})

Vince

On Fri, Jul 24, 2009 at 9:39 AM, Stefan Lesicnik  wrote:

> Hi Guys,
>
> It seems like this keeps coming up (for me anyways), and i'm never sure how
> to do it. I'm very new to programming...
>
> I have a file that has text in a certain format. Lets assume
>
> '''
> name: stefan
> id: 12345
> color: blue
> name: joe
> id: 54321
> color: red
> '''
>
> The format is predictable.  I understand for non predictable text, you
> would have to use pyparser or the like to build a match.
>
> For predictable format, I am never sure how to handle this. I normally use
> something like
>
> for line in file:
> line.split('\n')
>
> The problem being i dont really do something per line?  I would like to say
> something like, for line until the next 'name', make that 1 element.
> So i would like to then have a list or dict (this probably makes sense for
> a dict) with that group. I would then probably split it into various
> elements.
>
> So essentially im asking, how do i say the for line until next 'match'.
> Would this be something for the re module? Or is there an inbuilt core way?
>
> I hope this makes sense
>
> Thanks!
>
> Stefan
>
>
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Re: [Tutor] Web crawling!

[vince spicer]

On Wed, Jul 29, 2009 at 9:59 AM, Raj Medhekar wrote:

> Does anyone know a good webcrawler that could be used in tandem with the
> Beautiful soup parser to parse out specific elements from news sites like
> BBC and CNN? Thanks!
> -Raj
>
>
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>

I have used httplib2 http://code.google.com/p/httplib2/ to crawl sites(with
auth/cookies) and lxml (html xpath) to parse out links.

but you could use builtin urllib2 to request pages if no auth/cookie support
is required, here is a simple example

import urllib2
from lxml import html

page = urllib2.urlopen("http://this.page.com ")
data = html.fromstring(page.read())

all_links = data.xpath("//a") # all links on the page

for link in all_links:
print link.attrib["href"]
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Re: [Tutor] Issues with regex escaping on \{

[vince spicer]

On Wed, Jul 29, 2009 at 11:35 AM, gpo  wrote:

>
> My regex is being run in both Python v2.6 and v3.1
> For this example, I'll give one line.  This lines will be read out of log
> files.  I'm trying to get the GUID for the User ID to query a database with
> it, so I'd like a sub match.  Here is the code
> -
> import re
> line = '>Checking Privilege for UserId:
> {88F96ED2-D471-DE11-95B6-0050569E7C88}, PrivilegeId:
> {71AD2527-8494-4654-968D-FE61E9A6A9DF}. Returned hr = 0'
> pUserID=re.compile('UserID: \{(.+)\}',re.I)  #Sub match is one or more
> characters between the first set of squigglies immediately following
> 'UserID: '
>
> #the output is:
> (re.search(pUserID,line)).group(1)
> '88F96ED2-D471-DE11-95B6-0050569E7C88}, PrivilegeId:
> {71AD2527-8494-4654-968D-FE61E9A6A9DF'
> ---
> Why isn't the match terminating after it finds the first \}  ?
> --
> View this message in context:
> http://www.nabble.com/Issues-with-regex-escaping-on-%5C%7B-tp24724060p24724060.html
> Sent from the Python - tutor mailing list archive at Nabble.com.
>
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your grouping (.+) appears to be greedy, you can make it non-greedy with a
question mark

EX:

pUserID=re.compile('UserID:\s+{(.+?)}',re.I)

Vince
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Re: [Tutor] Assigning each line of text to a separate variable

[vince spicer]

On Thu, Jul 30, 2009 at 1:19 PM, Marv Boyes  wrote:

> Hello, all. This is probably embarrassingly basic, but I haven't been able
> to find something that works.
>
> I'm working on a script that needs to manipulate a list (not 'list' in the
> Python sense) of URLs returned in a server response. Right now, I'm
> stripping the XML tags from that response and assigning the resulting list
> of URLs to a variable so I can print it in the terminal. So when I do, say,
> 'print urls' I get something like this:
>
>http://server.com/thing1
>http://server.com/thing2
>http://server.com/thing3
>
> And so on. What I would _like_ to do is assign each line of that list to a
> separate variable, so that I can format my output to be more explicit;
> something like this:
>
>Link to Thing1: http://server.com/thing1
>Link to Thing2: http://server.com/thing2
>
> And so on. I know this should be extremely easy, but I appear to be having
> some manner of mental block. Any and all guidance would be greatly
> appreciated; many thanks in advance.
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Hello,

you could use a dictionary to assign a key value and a descrption, but
without seeing some data this is very rough

data = {}
for line in response:
key, value = response.split(",")  # line is "myname, http://blah.com";
data[key] = value

#then later
for key, value in data.items():
print "Link To %s : %s" % key, value
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Re: [Tutor] Looking up a value in a dictionary from user input problem

[vince spicer]

On Thu, Aug 6, 2009 at 3:18 PM, chase pettet  wrote:

> I am trying to write a script to work our LVS implementation.  I want to be
> able to have  user do something like this "./script SITE SERVER" and have
> the script look up the ip value of the site on that server and issue the
> command to pull the status from LVS.  I am almost there but for some reason
> when I try to pass the site parameter dynamically (the name of the
> dictionary) I keep getting errors about value type.  I have two example that
> work where the dictionary name is hard coded to to speak in the script, and
> the value I want to pull is dynamic using sys.argv[1], and one where I'm
> trying to pass the dictionary name and it does not work.  I tried to slim
> thse examples down, so hopefully they are helpful:
>
> works #1...
>
> ./script.py t
>
> #!/usr/bin/env python
> site = {"l":"10.1.1.1", "t":"10.1.1.2", "x":"10.1.1.3", "s1":"10.1.1.4",
> "s2":"10.1.1.5", "s3":"10.1.1.6"}
>
> def runBash(cmd):
>   p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
>   out = p.stdout.read().strip()
>   return out
>
> class LVS_Site:
>   def show(self, site):
> showsite = "ipvsadm -L -t %s:443" % (site)
> showsiteresult = runBash(showsite)
> return showsiteresult
>
> a = LVS_Site()
> b = site["%s" % (sys.argv[1])]
> c = a.show(b)
> print ""
> print ""
> print ""
> print c
>
> works #2...
>
> ./script.py t
>
> #!/usr/bin/env python
> site = {"l":"10.1.1.1", "t":"10.1.1.2", "x":"10.1.1.3", "s1":"10.1.1.4",
> "s2":"10.1.1.5", "s3":"10.1.1.6"}
>
> def runBash(cmd):
>   p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
>   out = p.stdout.read().strip()
>   return out
>
> class LVS_Site:
>   def show(self, site):
> showsite = "ipvsadm -L -t %s:443" % (site)
> showsiteresult = runBash(showsite)
> return showsiteresult
>
> a = LVS_Site()
> z = site
> b = z["%s" % (sys.argv[1])]
> c = a.show(b)
> print ""
> print ""
> print ""
> print c
>
>
> Not working...
>
> ./script.py t site
>
> #!/usr/bin/env python
> site = {"l":"10.1.1.1", "t":"10.1.1.2", "x":"10.1.1.3", "s1":"10.1.1.4",
> "s2":"10.1.1.5", "s3":"10.1.1.6"}
>
> def runBash(cmd):
>   p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
>   out = p.stdout.read().strip()
>   return out
>
> class LVS_Site:
>   def show(self, site):
> showsite = "ipvsadm -L -t %s:443" % (site)
> showsiteresult = runBash(showsite)
> return showsiteresult
>
> a = LVS_Site()
> z = sys.argv[2]
> b = b["%s" % (sys.argv[1])]
> c = a.show(b)
> print ""
> print ""
> print ""
> print c
>
> Error:
>
> Traceback (most recent call last):
>   File "./python2.py", line 22, in ?
> b = z["%s" % (sys.argv[1])]
> TypeError: string indices must be integers
>
>
> I don't understand why the third one does not work. Thanks for any help!
>
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>
>
In your code

z = sys.argv[2] which is a string

think you want

b = site[z]
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Re: [Tutor] Looking up a value in a dictionary from user input problem

[vince spicer]

On Thu, Aug 6, 2009 at 3:42 PM, vince spicer  wrote:

>
>
> On Thu, Aug 6, 2009 at 3:18 PM, chase pettet  wrote:
>
>> I am trying to write a script to work our LVS implementation.  I want to
>> be able to have  user do something like this "./script SITE SERVER" and have
>> the script look up the ip value of the site on that server and issue the
>> command to pull the status from LVS.  I am almost there but for some reason
>> when I try to pass the site parameter dynamically (the name of the
>> dictionary) I keep getting errors about value type.  I have two example that
>> work where the dictionary name is hard coded to to speak in the script, and
>> the value I want to pull is dynamic using sys.argv[1], and one where I'm
>> trying to pass the dictionary name and it does not work.  I tried to slim
>> thse examples down, so hopefully they are helpful:
>>
>> works #1...
>>
>> ./script.py t
>>
>> #!/usr/bin/env python
>> site = {"l":"10.1.1.1", "t":"10.1.1.2", "x":"10.1.1.3", "s1":"10.1.1.4",
>> "s2":"10.1.1.5", "s3":"10.1.1.6"}
>>
>> def runBash(cmd):
>>   p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
>>   out = p.stdout.read().strip()
>>   return out
>>
>> class LVS_Site:
>>   def show(self, site):
>> showsite = "ipvsadm -L -t %s:443" % (site)
>> showsiteresult = runBash(showsite)
>> return showsiteresult
>>
>> a = LVS_Site()
>> b = site["%s" % (sys.argv[1])]
>> c = a.show(b)
>> print ""
>> print ""
>> print ""
>> print c
>>
>> works #2...
>>
>> ./script.py t
>>
>> #!/usr/bin/env python
>> site = {"l":"10.1.1.1", "t":"10.1.1.2", "x":"10.1.1.3", "s1":"10.1.1.4",
>> "s2":"10.1.1.5", "s3":"10.1.1.6"}
>>
>> def runBash(cmd):
>>   p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
>>   out = p.stdout.read().strip()
>>   return out
>>
>> class LVS_Site:
>>   def show(self, site):
>> showsite = "ipvsadm -L -t %s:443" % (site)
>> showsiteresult = runBash(showsite)
>> return showsiteresult
>>
>> a = LVS_Site()
>> z = site
>> b = z["%s" % (sys.argv[1])]
>> c = a.show(b)
>> print ""
>> print ""
>> print ""
>> print c
>>
>>
>> Not working...
>>
>> ./script.py t site
>>
>> #!/usr/bin/env python
>> site = {"l":"10.1.1.1", "t":"10.1.1.2", "x":"10.1.1.3", "s1":"10.1.1.4",
>> "s2":"10.1.1.5", "s3":"10.1.1.6"}
>>
>> def runBash(cmd):
>>   p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
>>   out = p.stdout.read().strip()
>>   return out
>>
>> class LVS_Site:
>>   def show(self, site):
>> showsite = "ipvsadm -L -t %s:443" % (site)
>> showsiteresult = runBash(showsite)
>> return showsiteresult
>>
>> a = LVS_Site()
>> z = sys.argv[2]
>> b = b["%s" % (sys.argv[1])]
>> c = a.show(b)
>> print ""
>> print ""
>> print ""
>> print c
>>
>> Error:
>>
>> Traceback (most recent call last):
>>   File "./python2.py", line 22, in ?
>> b = z["%s" % (sys.argv[1])]
>> TypeError: string indices must be integers
>>
>>
>> I don't understand why the third one does not work. Thanks for any help!
>>
>> ___
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>> http://mail.python.org/mailman/listinfo/tutor
>>
>>
> In your code
>
> z = sys.argv[2] which is a string
>
> think you want
>
> b = site[z]
>

or even better

b =  site.get(z, None)
if b is None:
print "Not Found"
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Re: [Tutor] how to remove first '/'

[vince spicer]

On Tue, Aug 25, 2009 at 3:55 PM,  wrote:

> Hello,
> I want to strip the first '/' from the following:
>
> '/path/to/file'
>
> How can I do this?
>
> Dave
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there are many ways to do this, heres a few:

x = "/path/to/file"

print x.partition("/")[-1]
print x[1:]
print "/".join(x.split("/")[1:])
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Re: [Tutor] packing a list of lists

[vince spicer]

On Fri, Aug 28, 2009 at 8:05 AM, kevin parks  wrote:

> Back to python after a long long layoff. So i am running into some
> beginner's confusion...
>
> I am trying to plot a list of numbers in gnuplot.py. To do that I am trying
> to pack the list with an index by iterating over the list so i can get
> something like:
>
> foo = [12, 11, 9, 6, 2, 9, 3, 8, 12, 3, 5, 6]
>
> [ [1, 12], [2, 11], [3, 9], [4, 6], [5, 2], [6, 9], [7, 3], [8, 8] ... ]
>
> So that i have x, y pairs to plot. When i print in my func i get the right
> thing, for each item (note scaffolding) yet when i reurn the whole list i
> just get the last pair repeated over and over.
>
> I am not sure why this is.
>
>
> def pack(in_seq):
>out_list=[]
>x = 1
>ll=[1, 1]
>for each in in_seq:
>ll[0] = x
>ll[1] = each
>out_list.append(ll)
>#print ll
>x = x + 1
>print out_list
>
>
> # function declarations would go here
> def test():
>"""test function - say what this does here and skip a line
>
>Keyword arguments:
>none
>"""
>
>print
>foo = minus(200)
>plot_me = pack(foo)
>#print foo
>print
>print plot_me
>
>
> if __name__ == "__main__":
>test()
>
>
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>


Although I didn't test your code, I think what you are trying to accomplish
can be done using enumerate cleaner


def pack(foo):
out = []
for x,y in enumerate(foo, 1):
out.append((x,y))
return out
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Re: [Tutor] packing a list of lists

[vince spicer]

On Fri, Aug 28, 2009 at 9:18 AM, vince spicer  wrote:

>
>
> On Fri, Aug 28, 2009 at 8:05 AM, kevin parks  wrote:
>
>> Back to python after a long long layoff. So i am running into some
>> beginner's confusion...
>>
>> I am trying to plot a list of numbers in gnuplot.py. To do that I am
>> trying to pack the list with an index by iterating over the list so i can
>> get something like:
>>
>> foo = [12, 11, 9, 6, 2, 9, 3, 8, 12, 3, 5, 6]
>>
>> [ [1, 12], [2, 11], [3, 9], [4, 6], [5, 2], [6, 9], [7, 3], [8, 8] ... ]
>>
>> So that i have x, y pairs to plot. When i print in my func i get the right
>> thing, for each item (note scaffolding) yet when i reurn the whole list i
>> just get the last pair repeated over and over.
>>
>> I am not sure why this is.
>>
>>
>> def pack(in_seq):
>>out_list=[]
>>x = 1
>>ll=[1, 1]
>>for each in in_seq:
>>ll[0] = x
>>ll[1] = each
>>out_list.append(ll)
>>#print ll
>>x = x + 1
>>print out_list
>>
>>
>> # function declarations would go here
>> def test():
>>"""test function - say what this does here and skip a line
>>
>>Keyword arguments:
>>none
>>"""
>>
>>print
>>foo = minus(200)
>>plot_me = pack(foo)
>>#print foo
>>print
>>print plot_me
>>
>>
>> if __name__ == "__main__":
>>test()
>>
>>
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>>
>
>
> Although I didn't test your code, I think what you are trying to accomplish
> can be done using enumerate cleaner
>
>
> def pack(foo):
> out = []
> for x,y in enumerate(foo, 1):
> out.append((x,y))
> return out
>
>
>
>
Or even cleaner with list comprehension

def pack(foo):
return [x for x in enumerate(foo, 1)]
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Re: [Tutor] packing a list of lists

[vince spicer]

On Fri, Aug 28, 2009 at 10:49 AM, kevin parks  wrote:

>
> Thanks for the replies. Though the list comprehension does not work:
>
> TypeError: enumerate() takes exactly 1 argument (2 given)
>
>
> On Aug 29, 2009, at 12:20 AM, vince spicer wrote:
>
>
>>
>>   #print foohough I didn't test your code, I think what you are trying
>> to accomplish can be done using enumerate cleaner
>>
>>
>> def pack(foo):
>>out = []
>>for x,y in enumerate(foo, 1):
>>out.append((x,y))
>>return out
>>
>>
>>
>>
>> Or even cleaner with list comprehension
>>
>> def pack(foo):
>>return [x for x in enumerate(foo, 1)]
>>
>>
>>
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>

What version of python are using, python 2.6+ have a "start" parameter

http://docs.python.org/library/functions.html#enumerate
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Re: [Tutor] Boolean operations

[vince spicer]

On Wed, Sep 2, 2009 at 4:30 AM, Anthony Casey  wrote:

> Hello, tutors.
>
> I'm someone who used to programme as a hobby and who is trying to get back
> into it via Python. I'm reading Programming in Python 3 by Summerfield
> (excellent book).
>
> I read something unusual about Boolean operations in Python:
>
> >>> five = 5
> >>> two = 2
> >>> zero = 0
> >>> five and two
> 2
>
> I understand what it's doing here: returning the operand. But what is the
> practical application of that? How might I use that function?
> (Short-sighted
> imagination, I realise.)
>
> (I know how binary Booleans work etc., so this is a bit of a change of
> outlook.)
>
> Please pardon me if this is a silly or inane question.
>
> Regards,
> Anthony
>
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this might make the "and" operator a little clearer

http://pyref.infogami.com/and

Vince
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Re: [Tutor] I always get this message as a reply

[vince spicer]

On Wed, Sep 2, 2009 at 7:55 AM, Kristina Ambert wrote:

> Hi,
>
> I just wanted to ask if everyone else gets this message as a first reply
> everytime you send out a message to tutor.
> It feels like I'm getting spam or something.
> Geneviève DIAGORN to me
> show details 3:59 PM (17 hours ago)
>
> Bonjour,
> Je suis absente jusqu'au 02/09 inclus.
> En cas d'urgence Soprane, contacter notre adresse générique
> projet.sopr...@teamlog.com.
> Cordialement.
>
> Geneviève
>
>
>
>
> --
> Krissy
> ---
> Testing the waters is always fun...
>
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>

Someone on the list has gone on vacation and has an auto responder to tell
clients that they are away.

Vince
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Re: [Tutor] Getting list of attributes from list of objects

[vince spicer]

On Thu, Sep 10, 2009 at 8:51 AM, Oleg Oltar  wrote:

> Hi!
>
> I have the following list
>
> l= [ a, b, c]
>
> Where a,b,c are objects created from one class, e.g. each has title
> attribute.
> What I want to have is a list of titles, e.g. [a.title, b.title, c.title]
>
> Is there a quick way to do it? Or I should use loops (looping through each
> element, and generating list)
>
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>
you can use list comprehension, which is a type of loop, but looks so pretty
:)

titles = [x.title for x in l]

Vince
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Re: [Tutor] Image manipluation (On-the-fly thumbnail creation)

[vince spicer]

On Tue, Sep 15, 2009 at 10:03 AM, dan06  wrote:

>
> I've recently delved into python, about a week or so ago; I'm trying to
> figure out how to create on-the-fly thumbnails. Are there python standard
> library modules I could/should use or should I use external libraries like:
> GD, Gimp, or ImageMagick?
> --
> View this message in context:
> http://www.nabble.com/Image-manipluation-%28On-the-fly-thumbnail-creation%29-tp25456792p25456792.html
> Sent from the Python - tutor mailing list archive at Nabble.com.
>
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check out:

http://www.pythonware.com/products/pil/


creating thumbnail example here

http://www.pythonware.com/library/pil/handbook/image.htm


Vince
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Re: [Tutor] Help required

[vince spicer]

On Fri, Sep 25, 2009 at 1:56 PM, waqas ahmad  wrote:

>
>
>  Hi,
>
> I dont know it is the right place to post this question. I need help to
> change one search code line . can you help me please.
>
> here is my search method code:
>
> search=re.compile("^#acl InternationalGroup.*\n", re.M).search(pagetext)
> if search:
> ret=search.group()
> else:
> ret='not defined'
> return ret
>
> here i am searching for "#acl InternationalGroup" in the pageText and when
> it true is then give me search group.
>
>
> I want to change this for following requirement:
>
> I want to search  for "#acl InternationalGroup" and  "CatInternational" for
> both in the pageText.
> when "#acl InternationalGroup" is not there but only "CatInternational" is
> there. then return me search group.
>
> I shall be thankful to you for any help.
>
> Best Regards,
> Waqas
>
>
>
> --
> What can you do with the new Windows Live? Find 
> out
>
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>
i think this is what you are looking for:



search=re.compile("(#acl\sInternationalGroup|CatInternational).*\n",
re.M).search(pagetext)
if search:
ret=search.findall()
else:
ret='not defined'
return ret
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Re: [Tutor] help with alternate execution

[vince spicer]

On Tue, Sep 29, 2009 at 10:59 AM,  wrote:

> I'm trying to make a very simple example to show alternate execution... if
> a
> number is divisible by 3 it will say so and if it isnt, it will say so.
> Heres my
> program
>
> n= raw_input("enter a number= ")
> def divisible(n):
>if n%3 == 0:
>print n, "is divisible by 3"
>else:
>print n, "is not divisible by 3"
> print divisible
>
> when I try it out, and enter 3, I get this--
>
> enter a number= 3
> 
> >>>
>
> I'm not sure why I am getting this and am not quite sure what this means...
> could someone explain what I am doing wrong here and why it is telling me
> this?
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You need the call the function with the user input

n = raw_input("enter a number= ")
def divisible(n):
   if n%3 == 0:
   print n, "is divisible by 3"
   else:
   print n, "is not divisible by 3"
print divisible(n)


Vince
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Re: [Tutor] how to run php scripts in pylons framework?

[vince spicer]

On Fri, Oct 2, 2009 at 1:24 AM, ggi ggi  wrote:

>
> Dear All,
>
>  I have some php scripts which I don't want to rewrite in python. How can I
> run php Scripts in python?
>
> Thanks in advance
> Googi G
>
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>

Although rewriting is a better option, you can use the subprocess module to
make system calls to the php interpreter


import subprocess

#simple caller, disguard output

subprocess.call("php /path/to/my/old/script.php")

# if you want output

proc = subprocess.Popen("php /path/to/my/script.php", shell=True,
stdout=subprocess.PIPE)

script_response = proc.stdout.read()



Hope that helps,

Vince
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Re: [Tutor] Package for verify validity of any kind of IP

[vince spicer]

On Thu, Oct 8, 2009 at 2:38 AM, Ansuman Dash  wrote:

> Hi,
>
> Can anybody suggest me a package to verify validity of any kind of IP, i.e.
> IPv4 or IPv6.
>
> Thanks,
> AD
>
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>
I have used googles ipaddr package and have found it to work quite well

http://code.google.com/p/ipaddr-py/

Vince
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Re: [Tutor] Help with pexpect

[vince spicer]

On Fri, Oct 16, 2009 at 1:45 PM, Nathan Farrar wrote:

> I'm trying to automate the collection of data to remote devices over
> ssh via pexpect.  I had originally attempted (with limited success) to
> use paramiko, however due to cisco's ssh implimentation I cannot send
> mulitple commands over the same connection, which is absolutely
> essential.  Therefore, I'm now attempting to use pexpect, but am
> having trouble getting started.  I have a simple script, such as:
>
> session = pexpect.spawn('ssh u...@host')
> session.expect([pexpect.TIMETOUT, 'password:'])
> session.send('password')
> print session.read() # shouldn't this display the logon banner & command
> prompt?
> session.close()
>
> This code results in no output & a hanging window. What am I doing
> incorrect?
>
> Additionally, I will need to add conditional pexpect statements, such
> that when I execute a command I want to gather the output, however if
> '--More--' is encountered (and it this can happen multiple times), I
> want to send a newline character to the session and continue gathering
> the output.
>
> Thanks for the help!
> Nathan
>
> --
> "The presence of those seeking the truth is infinitely to be preferred
> to the presence of those who think they've found it."
>
> –Terry Pratchett
> ___
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>

when using pexpect for ssh you can run into some issues, I have used to
script some elaborate green screen apps, but not without some unforeseen
bugs

when connecting to a new machine, most ssh client will ask you verify the
fingerprint

something like:

> are you sure you want to continue (yes/no)?

also session.send < doesn't send eol "\n" but sendline does

So this should fix your connection

###
session = pexpect.spawn('ssh u...@host')
i = session.expect([pexpect.TIMETOUT, 'password:', "yes/no"])
if i == 2:
session.sendline("yes")
session.expect([pexpect.TIMETOUT, 'password:'])
if i == 1:
session.sendline('password')
print session.read() # shouldn't this display the logon banner & command
prompt?
session.close()
###

the other your question,  pexpects sendline(''), will just send a newline

not perfect but should work
###
license = ""
while True:
i = session.expect(["--more--", "yes/no"])
if i == 1:
   break
license += session.before
session.sendline('')
###


Vince
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Re: [Tutor] Testing for empty list

[vince spicer]

On Sun, Oct 18, 2009 at 7:29 PM, Wayne  wrote:

> Hi, I think I recall seeing this here, but I wanted to make sure I'm
> correct.
> Is the best way to test for an empty list just test for the truth value?
> I.e.
>
> mylist = [1,2,3]
>
> while mylist:
>print mylist.pop()
>
> Thanks,
> Wayne
>
> --
> To be considered stupid and to be told so is more painful than being called
> gluttonous, mendacious, violent, lascivious, lazy, cowardly: every weakness,
> every vice, has found its defenders, its rhetoric, its ennoblement and
> exaltation, but stupidity hasn’t. - Primo Levi
>
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>
I believe it is better to check the list length, I think some changes are
coming on evaling list


mylist = [1,2,3]

while len(mylist) > 0:
   print mylist.pop()






Vince
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Re: [Tutor] "if clause" in list comprehensions.

[vince spicer]

On Mon, Oct 19, 2009 at 1:58 PM, Emile van Sebille  wrote:

> On 10/19/2009 12:20 PM Alan Gauld said...
>
>
>> "Sander Sweers"  wrote
>>
>>  mylist = ['John', 'Canada', 25, 32, 'right']
 a = [item.upper() for item in mylist if type(item) == type('good')]

>>>
>>> Usually it is recommended to use hasattr() instead of type()
>>>   hasattr(s, 'upper')
>>>
>>
>> Nope, they do  completely different things
>> I think you might be thinking of isinstance() which can be used instead of
>> type(). I see you use hasattr as a means of testing for a method but that is
>> still different from testing type - the method names might be the same but
>> the functions be completely different in effect!
>>
>>  returned this: ['JOHN', 'CANADA', 'RIGHT']
 I was expecting this: ['JOHN', 'CANADA', 25, 32, 'RIGHT']
 So, actually the "if" acted like a filter.

>>>
>> It is intended to be used as a filter.
>>
>>  In order to use a list comprehension I created this function instead.
 def upperfy(item)
   try:
   item = item.upper()
   except AttributeError:
   pass
   return item

>>>
>>  I would move return item under the except and remove the pass, other
>>> might disagree on this.
>>>
>>
>> I would :-)
>> Doing that would result in None being returned for each successful
>> conversion. The OPs code is correct (even if unnecessary)
>>
>>  a = [upperfy(item) for item in mylist]

>>>
>> a = [item.upper() if type(item) == str else item for item in mylist]
>>
>> should do it I think.
>>
>
> or even
>
>  a = [ str(item).upper() for item in mylist ]
>
> Emile
>
>
>
>> HTH,
>>
>>
>>
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Lambda can save the day to keep everything on one line, and leave variable
type the same:

mylist = ['John', 'Canada', 25, 32, 'right']
new_list = [(lambda y: y.upper() if hasattr(y, 'upper') else y)(a) for a in
x]

>>  ['JACK', 'CANADA', 25, 32, 'RIGHT']

Vince
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Re: [Tutor] "if clause" in list comprehensions.

[vince spicer]

On Mon, Oct 19, 2009 at 2:14 PM, vince spicer  wrote:

>
>
> On Mon, Oct 19, 2009 at 1:58 PM, Emile van Sebille  wrote:
>
>> On 10/19/2009 12:20 PM Alan Gauld said...
>>
>>
>>> "Sander Sweers"  wrote
>>>
>>>  mylist = ['John', 'Canada', 25, 32, 'right']
>>>>> a = [item.upper() for item in mylist if type(item) == type('good')]
>>>>>
>>>>
>>>> Usually it is recommended to use hasattr() instead of type()
>>>>   hasattr(s, 'upper')
>>>>
>>>
>>> Nope, they do  completely different things
>>> I think you might be thinking of isinstance() which can be used instead
>>> of type(). I see you use hasattr as a means of testing for a method but that
>>> is still different from testing type - the method names might be the same
>>> but the functions be completely different in effect!
>>>
>>>  returned this: ['JOHN', 'CANADA', 'RIGHT']
>>>>> I was expecting this: ['JOHN', 'CANADA', 25, 32, 'RIGHT']
>>>>> So, actually the "if" acted like a filter.
>>>>>
>>>>
>>> It is intended to be used as a filter.
>>>
>>>  In order to use a list comprehension I created this function instead.
>>>>> def upperfy(item)
>>>>>   try:
>>>>>   item = item.upper()
>>>>>   except AttributeError:
>>>>>   pass
>>>>>   return item
>>>>>
>>>>
>>>  I would move return item under the except and remove the pass, other
>>>> might disagree on this.
>>>>
>>>
>>> I would :-)
>>> Doing that would result in None being returned for each successful
>>> conversion. The OPs code is correct (even if unnecessary)
>>>
>>>  a = [upperfy(item) for item in mylist]
>>>>>
>>>>
>>> a = [item.upper() if type(item) == str else item for item in mylist]
>>>
>>> should do it I think.
>>>
>>
>> or even
>>
>>  a = [ str(item).upper() for item in mylist ]
>>
>> Emile
>>
>>
>>
>>> HTH,
>>>
>>>
>>>
>> ___
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>> http://mail.python.org/mailman/listinfo/tutor
>>
>
>
> Lambda can save the day to keep everything on one line, and leave variable
> type the same:
>
> mylist = ['John', 'Canada', 25, 32, 'right']
> new_list = [(lambda y: y.upper() if hasattr(y, 'upper') else y)(a) for a in
> mylist ]
>
> >>  ['JACK', 'CANADA', 25, 32, 'RIGHT']
>
> Vince
>

wrong var name "x", fixed
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Re: [Tutor] Pexpect maxread & searchwindowsize, timeout

[vince spicer]

On Tue, Oct 20, 2009 at 11:11 AM, Nathan Farrar wrote:

> I haven't been able to find any real examples of pexpect usage, nor
> documentation.  Just little bits here and there, so I'm kind of
> struggling through.
>
> I've got the follow bit of code I'm working with:
>
> def main():
>try:
>print 'attempting to spawn connection ... '
>session = pexpect.spawn('ssh usern...@x.x.x.x')
>except:
>print 'couldn\'t spawn connection ... '
>
>print 'waiting for password prompt ... '
>session.expect('password:')
>print 'received password prompt ... '
>
>try:
>print 'attempting to send password ... '
>session.sendline(password)
>except:
>print 'error sending password ... '
>
>print 'waiting for command prompt ... '
>session.expect(command_prompt)
>print 'received command prompt ... '
>
>try:
>print 'attempting to issue \'show version\' command ... '
>session.sendline([expect.TIMEOUT=1, 'show version'])
>except:
>print 'error issuing \'show version\' command ... '
>
>print 'waiting for command prompt ... '
>session.expect(command_prompt)
>print 'received command prompt ... '
>
>print 'attempting to print command results ... '
>print session.before
>
>print 'closing session ... '
>session.close()
>
> if __name__=='__main__':
>main()
>
> When I run this against a cisco device, it times out waiting for the
> command prompt after issuing the show version command.  However, if I
> change 'show version' to something like 'blah blah' it doesn't time
> out, and I get the results of the command (an error message that is
> much shorter in length).
>
> I believe that the results of the show version command are simply too
> large.  I think I may need to increase the size of maxread &
> searchwindowsize & set the timeout to something lower than the
> default, but I haven't been able to figure out how to do this
> correctly yet.
>
> Any help would be greatly appreciated.  I'm pulling my hair out.  Thank
> you.
>
> --
> "The presence of those seeking the truth is infinitely to be preferred
> to the presence of those who think they've found it."
>
> –Terry Pratchett
> ___
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>

Looks like you are trying to end multiple commands to the sendline and not
expect
you can specify the timeout on the expect line

try this code:

#

def main():
   try:
   print 'attempting to spawn connection ... '
   session = pexpect.spawn('ssh usern...@x.x.x.x')
   except:
   print 'couldn\'t spawn connection ... '

   print 'waiting for password prompt ... '
   session.expect('password:')
   print 'received password prompt ... '

   try:
   print 'attempting to send password ... '
   session.sendline(password)
   except:
   print 'error sending password ... '

   print 'waiting for command prompt ... '
   session.expect(command_prompt)
   print 'received command prompt ... '

   try:
   print 'attempting to issue \'show version\' command ... '
   session.sendline('show version') #: send only command
   except:
   print 'error issuing \'show version\' command ... '

   print 'waiting for command prompt ... '
   session.expect(command_prompt, timeout=1) #: set the timeout here
   print 'received command prompt ... '

   print 'attempting to print command results ... '
   print session.before

   print 'closing session ... '
   session.close()

if __name__=='__main__':
   main()

#==

Vince
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Re: [Tutor] i can't for the life of me get "#! /usr/bin/env python" or "#!/usr/bin/python" to work

[vince spicer]

On Wed, Oct 21, 2009 at 12:21 PM, Jason Willis wrote:

> hi everyone,
>
> sorry for the rather boring question but i'm having serious issues getting
> my programs to run from the command line without having to type "python"
> in-front of them. I've tried a lot of different variations on the
> #!/usr/bin/ etc. line and have come up with the following every time:
>
> *[r...@localhost moonshinerat]# mycode.py
> bash: mycode.py: command not found
> [r...@localhost moonshinerat]# mycode
> bash: mycode: command not found
> [r...@localhost moonshinerat]#
>
> I've chmod'ed the program and everything but i still get command not found
> from the shell. The only thing that does work is ./mycode.py but from what i
> understand that's been built into linux itself to work that way...
>
> please someone let me know what i'm doing wrong here and possibly help??
>
> thanks!
>
> *
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>
try:

./mycode.py

since i'm guess your current path isn't in the system path

Vince
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Re: [Tutor] i can't for the life of me get "#! /usr/bin/env python" or "#!/usr/bin/python" to work

[vince spicer]

On Wed, Oct 21, 2009 at 12:31 PM, vince spicer  wrote:

>
>
> On Wed, Oct 21, 2009 at 12:21 PM, Jason Willis 
> wrote:
>
>> hi everyone,
>>
>> sorry for the rather boring question but i'm having serious issues getting
>> my programs to run from the command line without having to type "python"
>> in-front of them. I've tried a lot of different variations on the
>> #!/usr/bin/ etc. line and have come up with the following every time:
>>
>> *[r...@localhost moonshinerat]# mycode.py
>> bash: mycode.py: command not found
>> [r...@localhost moonshinerat]# mycode
>> bash: mycode: command not found
>> [r...@localhost moonshinerat]#
>>
>> I've chmod'ed the program and everything but i still get command not found
>> from the shell. The only thing that does work is ./mycode.py but from what i
>> understand that's been built into linux itself to work that way...
>>
>> please someone let me know what i'm doing wrong here and possibly help??
>>
>> thanks!
>>
>> *
>> ___
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>>
>>
> try:
>
> ./mycode.py
>
> since i'm guess your current path isn't in the system path
>
> Vince
>
>
Sorry didn't read full post,

you would have add your program directory to the system path in order to
call the program by name

you can add this to you bashrc

export PATH=~/my/program/dir:"${PATH}"


Vince
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Re: [Tutor] i can't for the life of me get "#! /usr/bin/env python" or "#!/usr/bin/python" to work

[vince spicer]

On Wed, Oct 21, 2009 at 12:33 PM, vince spicer  wrote:

>
>
> On Wed, Oct 21, 2009 at 12:31 PM, vince spicer wrote:
>
>>
>>
>> On Wed, Oct 21, 2009 at 12:21 PM, Jason Willis 
>> wrote:
>>
>>> hi everyone,
>>>
>>> sorry for the rather boring question but i'm having serious issues
>>> getting my programs to run from the command line without having to type
>>> "python" in-front of them. I've tried a lot of different variations on the
>>> #!/usr/bin/ etc. line and have come up with the following every time:
>>>
>>> *[r...@localhost moonshinerat]# mycode.py
>>> bash: mycode.py: command not found
>>> [r...@localhost moonshinerat]# mycode
>>> bash: mycode: command not found
>>> [r...@localhost moonshinerat]#
>>>
>>> I've chmod'ed the program and everything but i still get command not
>>> found from the shell. The only thing that does work is ./mycode.py but from
>>> what i understand that's been built into linux itself to work that way...
>>>
>>> please someone let me know what i'm doing wrong here and possibly help??
>>>
>>> thanks!
>>>
>>> *
>>> ___
>>> Tutor maillist  -  Tutor@python.org
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>>> http://mail.python.org/mailman/listinfo/tutor
>>>
>>>
>> try:
>>
>> ./mycode.py
>>
>> since i'm guess your current path isn't in the system path
>>
>> Vince
>>
>>
> Sorry didn't read full post,
>
> you would have add your program directory to the system path in order to
> call the program by name
>
> you can add this to you bashrc
>
> export PATH=~/my/program/dir:"${PATH}"
>
>
> Vince
>

A better description of linux PATH:

http://www.linuxheadquarters.com/howto/basic/path.shtml
http://www.linfo.org/path_env_var.html

Vince
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Re: [Tutor] i can't for the life of me get "#! /usr/bin/env python" or "#!/usr/bin/python" to work

[vince spicer]

On Wed, Oct 21, 2009 at 3:56 PM, Jason Willis wrote:

> so i changed the .bashrc and added at the end :
> PATH="/home/compy/pythons:$PATH"  ###which is the actual path to my python
> proggies###
>
> and i still get
> co...@compy-laptop:~/pythons$ herosinventory.py
> herosinventory.py: command not found
> co...@compy-laptop:~/pythons$ herosinventory.py
> herosinventory.py: command not found
> co...@compy-laptop:~/pythons$ herosinventory
> herosinventory: command not found
> co...@compy-laptop:~/pythons$
>
>
> I must be retarded. I'm sorry , what am I doing wrong here?
>
>
> On Wed, Oct 21, 2009 at 2:31 PM, vince spicer wrote:
>
>>
>>
>> On Wed, Oct 21, 2009 at 12:21 PM, Jason Willis 
>> wrote:
>>
>>> hi everyone,
>>>
>>> sorry for the rather boring question but i'm having serious issues
>>> getting my programs to run from the command line without having to type
>>> "python" in-front of them. I've tried a lot of different variations on the
>>> #!/usr/bin/ etc. line and have come up with the following every time:
>>>
>>> *[r...@localhost moonshinerat]# mycode.py
>>> bash: mycode.py: command not found
>>> [r...@localhost moonshinerat]# mycode
>>> bash: mycode: command not found
>>> [r...@localhost moonshinerat]#
>>>
>>> I've chmod'ed the program and everything but i still get command not
>>> found from the shell. The only thing that does work is ./mycode.py but from
>>> what i understand that's been built into linux itself to work that way...
>>>
>>> please someone let me know what i'm doing wrong here and possibly help??
>>>
>>> thanks!
>>>
>>> *
>>> ___
>>> Tutor maillist  -  Tutor@python.org
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>>>
>>>
>> try:
>>
>> ./mycode.py
>>
>> since i'm guess your current path isn't in the system path
>>
>> Vince
>>
>>
>
you need export:

export PATH="/home/compy/pythons:$PATH


Vince
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Re: [Tutor] replacing a long list of if,elif

[vince spicer]

On Fri, Oct 23, 2009 at 9:05 AM, John  wrote:

> I'm using python 2.5
>
> I have a long list of if, elif, else.  I always thought it was very NOT
> pythonic.  It's easy to read but not pretty.
>
> for fldType in fieldList:
>  if "int" in fldType:
>  fld = "I"
>  elif "char" in fldType :
>  fld = "C"
>  elif "bool" in fldType :
> fld = "B" .
>  else:
> fld = '?'
>
>
> I have considered:
>
>  mydict = {'int': 'I', 'char':'C', 'bool':'B'}
>  for fldType in fieldList:
>try:
>fld = mydict[fldType]
>except:
>fld = '?'
>
> I also considered some sort of  lambda function as
>
> x = lambda fld: mydict[fldType]
>
> But could not determine how to account for the key exception. So I tried
>
> x = lambda fldType: mydict[fldType]
> if fldType in mydict:
>   x(fldType)
> else:
>fld = '?'
>
>
> Any suggestions would be helpful  and would help me learn.
>
> Johnf
>
>
>
>
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John,

Using a Dictionary is the best method to use here and you can use dict.get
in order to bypass the KeyError

EX:

myDict.get(fldType, None)

this will output the value from myDict if the key exists, if not it will
return None


Vince
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Re: [Tutor] Retrieving information from a plain text file (WinXP/py2.6.2/Beginner)

[vince spicer]

On Sun, Nov 1, 2009 at 5:37 PM, Katt  wrote:

> Hello all,
>
> Thank you all for your help.  I appreciate it alot.
>
> I have been trying to work with file IO alot recently and would like to
> improve my little program so that I no longer use a hard coded list, but a
> text file that I can edit easily.
>
> The text file is three lines long and looks exactly like this:
>
> Reminder1,2009_10_28
> Reminder2,2009_11_01
> Reminder3,2009_11_15
>
> My program consists of the following code:
> 
> #]--[import modules]--[
> from time import strftime, mktime, localtime
> from WConio import textcolor
> #][
> #]--[define functions]--[
> def read_reminders():
>   print "\nReading text file into program: reminders.txt"
>   text_file = open("reminders.txt","r")
>   reminders = [line.strip().split("'") for line in text_file]
>   text_file.close()
>   print reminders
> #
> def get_computer_date():
>   #Get today's date from the computer
>   todays_date = strftime("%Y_%m_%d")
>   return todays_date
> #
> def color_print(strings):
>   #Change the text color in the WinXP dos shell
>   #The way to use:
>   #color_print([("string",color number),\
>   #(str(variable),color number),(etc)])
>   for string in strings:
>   textcolor(string[1])
>   print string[0],
> #
> def change_to_julian(reminder_date):
>   #Receives the year, month, and day
>   #in the form of a single string (2009_10_15)
>   #and changes it into three different int
>   #variables.  Then take those three variables
>   #and append six zeros and change into a
>   #julian date.
>   date = []
>   date = reminder_date.split("_")
>   year = int(date[0])
>   month = int(date[1])
>   day = int(date[2])
>   timetuple = (year, month, day) + ( (0,) * 6 )
>   unixtime = mktime(timetuple)
>   timetuple = localtime(unixtime)
>   print days_left(timetuple[7])
>   # [7] is the number of julian-date field of
>   #the unixtime tuple.
>   return days_left(timetuple[7])
> #
> def days_left(julian_date):
>   #This function calculates the days left
>   #until a reminder.  If the days left are
>   #greater than 0 it will print normally.
>   #If it is -1 then it will print differently.
>   #Also if it is greater than -1 it will print
>   #yet again differently.
>   days_until_reminder = julian_date - localtime().tm_yday
>   if days_until_reminder > 0:
>   color_print ([("There are",7),(str(days_until_reminder),4),("days
> left until this reminder.",7),("\n",7)])
>   elif days_until_reminder == -1:
>   color_print ([("\tYou have missed this reminder
> by",4),(str(days_until_reminder*-1),4),("day!",4),("\n",7)])
>   color_print [("
>  
> ",4),("\n",7)])
>   else:
>   color_print ([("\tYou have missed this reminder
> by",4),(str(days_until_reminder*-1),4),("days!",4),("\n",7)])
>   color_print [("
>  
> ",4),("\n",7)])
> print
> #
> def compare_reminders(todays_date):
>   #This function compares the reminders
>   #to the computer date.
>   #It has three different paths:
>   # 1.Matches today's date
>   # 2.The reminder date has already
>   #  passed by
>   # 3.The reminder date is yet to
>   #  come.
>   #After determining which it is it will
>   #access the change_to_julian and
>   #days_left functions.
>   #reminders.sort()
>   color_print ([("
> [-]",4),("\n",7)])
>   index = 0
>   while index < len(reminders):
>   if todays_date == reminders[index][1]:
>   print
>   color_print [("
>  
> ",4),("\n",7)])
>   print "Today's reminder is:
> ",reminders[index][0],"on",reminders[index][1]
>   color_print ([("\t\tTake care of this reminder
> immediately",2),("\n",7)])
>   elif todays_date > reminders[index][1]:
>   print
>   print "Whoops, you missed the following
> reminder.",reminders[index][0],"on",reminders[index][1]
>   change_to_julian(reminders[index][1])
>   else:
>   print
>   print "Your upcoming reminders are:
> ",reminders[index][0],"on",reminders[index][1]
>   change_to_julian(reminders[index][1])
>   index = index + 1
>   color_print ([("
> [-]",4),("\n",7)])
> #][
> #]---[Main Program]---[
> read_reminders()
> print reminders
> compare_reminders(get_computer_date())
> pause_it = raw_input("Press a key to end: ")
> #][
> 
> Could someone explain to me why my read_reminders function retrieves the
> information, but cannot 

Re: [Tutor] Unexpected Result in Test Sequence

[vince spicer]

On Mon, Nov 16, 2009 at 1:18 PM,  wrote:

> Hello Tutor list.
> I'm running a test to find what the experimental average of a d20 is, and
> came across a strange bug in my code.
> import random
> list1 = []
> def p():
>   d = 0
>   for number in range(1,1000):
>   t = random.randrange(1,19)
>   list1.append(t)
>   for value in list1:
>   d+=value
>   print d/1000
>   d = 0
> for value in range(1,100):
>   p()
>
> It works, but I have a logic error somewhere. It runs, and the results have
> a pattern :
> 9
> 19
> 28
> 37
> 47
> 56
> 66
> 75
> 85
> 94
> 104
> 113
> ...
> ...
> It just adds 10, and every second result, subtracts 1, till it gets to 0,
> and then starts again with 9 in singles, and whatever in the 10's, etc.
> What is causing this?
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I think that one problem you are seeing is caused by the use of integers
When you are dividing sum of the random number by 1000, python is rounding
your output.

Also your list, never gets cleared and you keep adding to the original list,
and you are then dividing by the original 1000


A simple fix is to use floats (PS: cleaned up a bit):

from random import randrange
def p():
mylist = [randrange(1,19) for x in range(1, 1000)]
d = sum(list)
print float(d) / len(mylist)

for value in range(1,100):
p()


Hope this point you in a better direction

Vince
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Re: [Tutor] Odd result from function call

[Vince Spicer]

On Fri, Jan 7, 2011 at 11:38 AM, Ben Ganzfried wrote:

> When I call one of my functions from the shell (ie compare(10, 5)) it
> produces the correct output.  However, when I run the program after calling
> the method later in the script, the result is bizarre.  I'm curious why the
> wrong result is printed.  Here is an example:
>
> def compare(x,y):
> if x < y:
> print (x, " is less than ", y)
> print("x is ", x, "y is ", y)
> elif x > y:
> print(x, " is greater than ", y)
> else:
> print(x, " and ", y, " are equal.")
>
>
> x = input("First x is: ")
> y = input("First y is: ")
> print("x is ", x)
> print("y is ", y)
> compare(x,y)
> a = input("Second x is: ")
> b = input("Second y is: ")
> print("x is ", a)
> print("y is ", b)
> compare(a,b)
> c = input("Third x is: ")
> d = input("Third y is: ")
> print("x is ", c)
> print("y is ", d)
> compare(c,d)
>
> Sample (and incorrect) output w/ 10, 5:
>
> First x is: 10
> First y is: 5
> x is  10
> y is  5
> 10  is less than  5
> x is  10 y is  5
> Second x is:
>
> When I do simply compare(10, 5) from the shell, I get the correct output
> (ie 10 is greater than 5).  I had thought I had narrowed the problem down to
> the fact that when I run the script only the first digit is counted--
> however, it seems as if only the first digit is counted (ie anything
> starting w/ a 9 will be greater than anything starting with a 1 (even if the
> numbers are 9 and 1324234)), and THEN, the second digit is counted (such
> that 89 is correctly identified at 81).
>
> Anyway I'm wondering:
> 1) Why does the script run correctly when I simply call the function from
> the shell but not when I try to call the function from within the script?
> 2) What is actually going on such that only the first digit is being
> evaluated?  That is, the interpreter knows that x is 10 and y is 5-- and
> yet, for some reason the 5 is being tested against the 1 and since 5 is
> bigger than 1, it concludes that 5 is greater than 10.
>
> thanks!
>
> Ben
>
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>
Ben

It would appear that you are comparing string in your script and not
integers

a=  int(input(...))

-- 
Vince Spicer
Developer
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Re: [Tutor] Help listing directory timestamps and deleting directories

[Vince Spicer]

On Mon, Jan 24, 2011 at 11:25 AM, bsd...@gmail.com  wrote:

> Hi, hoping for some help here. I've been trying to write a python script
> (complete newb) and have spent several days trying to get this right with no
> success.
>
> I am trying to list timestamps in a directory and if they are older than x
> amount of days delete the directories. It seems that in my for loop it is
> only evaluating the last timestamp of the last directory and using that
> timestamp to make the deletion decision. I realize that this script isn't
> going to delete the directories with evaluate as true but I haven't been
> able to get that far yet...
>
>
>
> ###start script##
> ###Modules###
>
> import os
> import time
>
> ###Global Variables###
>
> curr_t = time.time()
>
> days = 2629743 #2629743 is 30 days in epoch time.
>
> directory=os.path.join("/home", "userid", "python")
>
>
> for r,d,f in os.walk(directory):
> for dir in d:
> timestamp = os.path.getmtime(os.path.join(r,dir)) ## It seems that
> the below "if" statement is only comparing the timestamp of the last
> directory that this variable lists.
> print timestamp
> if curr_t - days < timestamp:   I am expecting
> this statement to compare each timestamp of the "directory" variable and
> print out if it should be deleted or not.
> print "Your file will be deleted"
>
> else:
> print "File will NOT be deleted..."
>
>
> ###end of script#
>
>
>
> Thank you for your time!
>
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>
First off, I would recommend using dates and not times, this can help make
things clearer
when dealing with dates, also the dateutil module can make date math a lot
simpler (easy_install dateutil)


from datetime import datetime
from dateutil.relativedelta import relativedelta

remove_after = datetime.now() - relativedelta(days=31)  # exactly 1 month
prior to today
check_dir = "/path/to/whatever"

for r,d,f in os.walk(check_dir):
for dir in d:
loc =  os.path.join(r,dir)
last_modified = datetime.fromtimestamp(os.path.getmtime(loc))
if last_modifed < remove_after:
print "delete old directory", loc
else:
print "keep recently modified", loc



Hope this helps,

Vince Spicer
Developer
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Re: [Tutor] Accessing a secured webpage

[Vince Spicer]

You may want to look at httplib2

http://code.google.com/p/httplib2/

This great module makes auth very simple

Vince

On Fri, Jan 28, 2011 at 3:54 PM, Karim  wrote:

>
> Hello,
>
> I want to create a client to access a webpage. But when I access it
> interactively  there is a dialog box
> which ask for login and password.
> I want to access it in batch via python but I could only found a basic
> example:
>
> #!/bin/env python# -*- coding: utf-8 -*-
>  import urllib2
> reponse = urllib2.urlopen('http://www.kernel.org/')
> xhtmldata = reponse.read()for num,ligne in enumerate(xhtmldata.splitlines()) :
> print "%04d - %s"%(num,ligne)
>
> I want to provide login and password via python code. The web adress is
> like http://website.com:8081/ddts/ddts_main.
> If you have link it is welcome!
>
> Regards
> Karim
>
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>


-- 
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Developer
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Re: [Tutor] Python Job Scheduling package

[Vince Spicer]

You could take a peak at these. Both work without external dependencies

http://packages.python.org/APScheduler/#features
http://pypi.python.org/pypi/TGScheduler/1.6.2

VInce

On Thu, Oct 13, 2011 at 3:53 AM, harish bansal
 wrote:
> Has anyone seen a python job scheduling framework that could provide the
> following features
>
> Add/remove job from the queue
> View job list
> check job status
> Run concurrent jobs.
>
> I am looking for something similar to
> coalition(http://code.google.com/p/coalition/)
> --
> Harry
>
>
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>



-- 
Vince Spicer
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Re: [Tutor] Datetime Integers

[Vince Spicer]

This should do what you want.

import time
timestring = '2010-10-10 01:10:00'
time_format = '%Y-%m-%d %H:%M:%S'
timestruct = time.strptime(timestring, time_format)
print [x for x in timestruct]


For complex date parsing I would recommend checking out the dateutil.parser
http://labix.org/python-dateutil



On Mon, May 21, 2012 at 9:47 AM, Jeremy Traurig wrote:

> Hello,
>
> Is there a module available for python to convert datetime into an
> array of integers. For example, I have date where the first column is
> a datetime string (i.e. '2010-10-10 01:10:00') and I would like to
> convert that into an array with 5 columns corresponding to the integer
> values of Year,Month,Day,Hour,Minute. There is a function in Matlab
> that performs called datevec() that performs this operation. I find it
> much easier to index datetime or perform calculations on other data
> when date and time are integers. For example, i generally need to
> calculate averages, std, etc based on specific months, years, days,
> and hours. Those calculations are extremely simple when I can index an
> array of datetime integers. If there is no module to convert datetime
> to an array of integers, does anyone have an example of how i might
> index datetime using python datetime or numpy datetime64? In each
> case, I would need an array of datetime the same dimension as my data
> array.
>
> thanks -- jeremy
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-- 
Vince Spicer
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Re: [Tutor] How install Pyramid on a Windows 7 computer?

[Vince Spicer]

Step 1)  install Ubuntu

OK sorry couldn't resist.

This should help.
http://docs.pylonsproject.org/projects/pyramid/en/latest/narr/install.html#installing-pyramid-on-a-windows-system

Vince

On Thu, May 31, 2012 at 10:20 AM, Tamar Osher wrote:

>  Months ago, I learned Python version 3.  I have read a few books, and
> want to learn how to use Python for the web.  Pyramid is a Python web
> framework that is ready for Python version 3, but I don't know how to
> install it on my Windows 7 computer.  Online, there are no Pyramid
> installation instructions that discuss how to install Pyramid on a Windows
> 7 computer.  Can someone please help me?
>
> from Tamar Osher, emeraldoff...@hotmail.com
>
>
> **
> *
>
>
>
> *
>
> * *
>
>
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