Re: [Tutor] loop until a keypress

[Peter Otten]

Surya K wrote:

> I want to run code until a "enter" is pressed. Well, it shouldn't wait for
> the user to enter "enter" This is my code:

This is what it looks like over here:

> import msvcrtchr = 0while chr != 'q': print "my code", if
> msvcrt.kbhit():   chr = msvcrt.getch() 

This is what I suppose you wrote:

> import msvcrt
> chr = 0
> while chr != 'q':
> print "my code",
> if msvcrt.kbhit():   
> chr = msvcrt.getch() 


> This isn't working the way
> I wanted. When ever I press enter, the loop is starting in a new line and
> continuing. I even added "break" statement in "if" block but it isn't
> workingCan you tell me how to do that? 

You could make a little experiment. Run

import msvcrt
while True:
if msvcrt.kbhit():
print msvcrt.getch()

and then press the 'q' key. What does this little script print? Can you 
apply the newly gained information to your original code?

> I am on windows. So, as msvcrt is
> for windows, I wonder if there is any module that works for both,

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Re: [Tutor] loop until a keypress

[Alan Gauld]

On 30/01/12 05:20, Surya K wrote:

I want to run code until a "enter" is pressed. Well, it shouldn't wait
for the user to enter "enter"

This is my code:

import msvcrt

chr = 0
while chr != 'q':
print "my code",
if msvcrt.kbhit():
chr = msvcrt.getch()



You shouldn't need the kbhit test.
Try just using:

while ky != 'q':
   ky = msvcrt.getch()
   print ky



I am on windows. So, as msvcrt is for windows, I wonder if there is any
module that works for both,


Both what?


--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/

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Re: [Tutor] loop until a keypress

[Christian Witts]

On 2012/01/30 07:20 AM, Surya K wrote:
I want to run code until a "enter" is pressed. Well, it shouldn't wait 
for the user to enter "enter"


This is my code:

import msvcrt

chr = 0
while chr != 'q':
 print "my code",
 if msvcrt.kbhit():
   chr = msvcrt.getch()

This isn't working the way I wanted. When ever I press enter, the loop 
is starting in a new line and continuing.


I even added "break" statement in "if" block but it isn't working
Can you tell me how to do that?

I am on windows. So, as msvcrt is for windows, I wonder if there is 
any module that works for both,



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There isn't a platform independent module for capturing keystrokes 
unfortunately.  You can take a look at this StackOverflow answer though 
which could help you out 
http://stackoverflow.com/questions/5044073/python-cross-platform-listening-for-keypresses 


--

Christian Witts
Python Developer
//
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Re: [Tutor] loop until a keypress

[Steven D'Aprano]

Surya K wrote:

I am on windows. So, as msvcrt is for windows, I wonder if there
is any module that works for both,


http://code.activestate.com/recipes/577977


--
Steven
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[Tutor] Sort

[George Nyoro]

Hey all, again:
Thanks for the delete thing. Helped with that problem a lot. Especially the
getattr thing came in handy.

Question 1:
How do you guys indent and put in the triple greater than signs and all
that when sending mail? Manually? Coz the last mail I sent was using the
gmail indent thing and it doesnt seem to have worked. Anyway:

Question 2:
I have this script that downloaded a lot of files from one server into one
local directory and the files are named in a particular order and I want
them to be opened in this very same order so that I can copy the contents
of each to one main file and then convert to pdf. However, the naming
schema is like this (Roman numerals in parts) and python doesn't seem to be
able to sort it properly.
1.I.1; 1.I.2; ; 1.I.20;
1.II.1.1;1.II.1.2
1.II.2;...1.II.10; 2.I.3;
Because of the roman numerals that are always in the second part fo the
filename, it could sort based on how I wanted.

I listed all the files in the said directory:
files=os.listdir(location)

I tried using a sort algorithm that goes through the list starting from
index 0 and then compares each index with the next one and if they are not
arranged as they should be, the two are switched and then it starts again.
The thing is, it is so slow! It hardly goes past index three in the list
and there are so many files. *about fifty*.

Could anyone help me with the python impelentation of such an algorith and
how it should sort. Thanks.
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Re: [Tutor] Tutor Digest, Vol 95, Issue 80

[Arun Kumar]

object works:
>
>  >>> x = 42
>  >>> x
> 42
>  >>> del(x)
>  >>> x
> Traceback (most recent call last):
>   File "", line 1, in 
> NameError: name 'x' is not defined
>  >>>
>
> If thats not what you want you need to come vback and explain what is
> different about your scenario.
>
> --
> Alan G
> Author of the Learn to Program web site
> http://www.alan-g.me.uk/
>
>
>
> --
>
> Message: 3
> Date: Sun, 29 Jan 2012 21:01:47 +0100
> From: Navneet 
> To: tutor@python.org
> Subject: Re: [Tutor] Socket Programming
> Message-ID: <4f25a5ab.5070...@gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> On 1/27/2012 10:13 PM, Steven D'Aprano wrote:
> > Navneet wrote:
> >
> >> One more thing I want to add here is, I am trying to create the GUI
> >> based chat server.(Attached the programs.)
> >
> >
> > Please do not send large chunks of code like this, unless asked.
> > Instead, you should try to produce a minimal example that demonstrates
> > the problem. It should be:
> >
> > * short (avoid code which has nothing to do with the problem)
> >
> > * self-contained (other people must be able to run it)
> >
> > * correct (it must actually fail in the way you say it fails)
> >
> > See here for more: http://sscce.org/
> >
> >
> > In cutting your code down to a minimal example, 9 times out of 10 you
> > will solve your problem yourself, and learn something in the process.
> >
> >
> >> bash-3.1$ python Client1.py
> >> Enter the server address:...9009
> >> Traceback (most recent call last):
> >>   File "Client1.py", line 53, in 
> >> c = ClientChat(serverport)
> >>   File "Client1.py", line 24, in __init__
> >> gui.callGui()
> >>   File "a:\FedEx\Exp\ClientGui.py", line 37, in callGui
> >> sendbutton =Button(f2, width = 5, height = 2, text = "Send",
> >> command = C.ClientChat.senddata())
> >> TypeError: unbound method senddata() must be called with ClientChat
> >> instance as first argument (got nothing instead)
> >
> >
> > This one is easy. You need to initialize a ClientChat instance first.
> > This may be as simple as:
> >
> > command = C.ClientChat().senddata
> >
> > although I'm not sure if ClientChat requires any arguments.
> >
> > Note that you call the ClientChat class, to create an instance, but
> > you DON'T call the senddata method, since you want to pass the method
> > itself as a callback function. The button will call it for you, when
> > needed.
> >
> >
> >
> Thanks for the clarification and telling me about SSCCE :)
>
> But just a simple thing,,, Can I call a method of another module while
> creating a GUI.
>
> For example
>  C = Tk()
> .(Some more lines)
> self.sendbutton =Button(self.f2, width = 5, height = 2, text = "Send",
> command = .)
> self.sendbutton.pack(side = LEFT, padx = 10, pady = 10)
> .(Some more lines)
> C.mainloop()
>
>
> Because I am getting stuck in a loop. The client is keep on connecting
> to server without creating a GUI.
>
>
>
>
>
>
>
>
>
>
>
>
>
> --
>
> Message: 4
> Date: Mon, 30 Jan 2012 00:28:21 +0200
> From: amt <0101...@gmail.com>
> To: tutor@python.org
> Subject: Re: [Tutor] Why do you have to close files?
> Message-ID:
> >
> Content-Type: text/plain; charset=ISO-8859-1
>
> All the replies were very helpful! Thank you very much for helping me out!
>
>
> --
>
> Message: 5
> Date: Mon, 30 Jan 2012 10:50:51 +0530
> From: Surya K 
> To: Python Tutor 
> Subject: [Tutor] loop until a keypress
> Message-ID: 
> Content-Type: text/plain; charset="iso-8859-1"
>
>
> I want to run code until a "enter" is pressed. Well, it shouldn't wait for
> the user to enter "enter"
> This is my code:
> import msvcrtchr = 0while chr != 'q': print "my code", if
> msvcrt.kbhit():   chr = msvcrt.getch()
> This isn't working the way I wanted. When ever I press enter, the loop is
> starting in a new line and continuing.
> I even added "break" statement in "if" block but it isn't workingCan you
> tell me how to do that?
> I am on windows. So, as msvcrt is for windows, I wonder if there is any
> module 

Re: [Tutor] Sort

[Steven D'Aprano]

George Nyoro wrote:

Hey all, again:
Thanks for the delete thing. Helped with that problem a lot. Especially the
getattr thing came in handy.

Question 1:
How do you guys indent and put in the triple greater than signs and all
that when sending mail? Manually? Coz the last mail I sent was using the
gmail indent thing and it doesnt seem to have worked. Anyway:



Copy text including >>> signs, and any other characters you want.
Paste into your email client. The characters should appear exactly as you 
copied and pasted them.


If your email client (gmail) takes it upon itself to mangle your text, then 
use a better email client that doesn't suck. (Any software which thinks it 
knows what you want better than you do should be taken out and slapped with a 
wet fish.)




Question 2:
I have this script that downloaded a lot of files from one server into one
local directory and the files are named in a particular order and I want
them to be opened in this very same order so that I can copy the contents
of each to one main file and then convert to pdf. However, the naming
schema is like this (Roman numerals in parts) and python doesn't seem to be
able to sort it properly.
1.I.1; 1.I.2; ; 1.I.20;
1.II.1.1;1.II.1.2
1.II.2;...1.II.10; 2.I.3;


I don't understand this. Is each line ONE file name, or are there many file 
names per line? Are the semi-colons part of the file names?


I'm going to *guess* that each file name has THREE sections only, with no 
semi-colons, and look like these 3 examples:


1.I.1
1.III.20
5.IX.7

etc. Am I close?



Because of the roman numerals that are always in the second part fo the
filename, it could sort based on how I wanted.

I listed all the files in the said directory:
files=os.listdir(location)

I tried using a sort algorithm that goes through the list starting from
index 0 and then compares each index with the next one and if they are not
arranged as they should be, the two are switched and then it starts again.
The thing is, it is so slow! It hardly goes past index three in the list
and there are so many files. *about fifty*.


Congratulations! You appear to have re-invented one of the world's slowest 
sorting functions, bubblesort.  Look it up on Wikipedia.


Only probably with a bug in it, because even bubblesort shouldn't get stuck 
after only three files.


Except as a learning exercise, or to prove you can, never try to program your 
own sort in Python. That's like buying a car, and then putting it on the back 
of your push-bike and trying to cycle home with it. Uphill. In the snow. With 
a flat tire.


Instead, you should use Python's built-in sort function, which if you use it 
properly is faster than anything you can write (unless you are Tim Peters, who 
invented it in the first place).


Normally, you would just do something like this:

files = os.listdir(location)
files.sort()  # sort the list in-place, without making a copy


or perhaps this:

files = sorted(os.listdir(location))  # make a copy and sort


but in this case you have special requirements, thanks to the naming 
convention for your files. In this case, you don't want the ordinary sort 
order for strings, you need a special sort order based on Roman numerals.


The best way to sort these is with a technique called:

Decorate, Sort, Undecorate

also known as DSU, which sorted() supports using a key function. It sounds 
harder than it is. In this case, you need to decorate each file name (which is 
hard to sort!) with something that is easier to sort. In this case, the 
filenames look like:


number DOT roman number DOT number

all as one string, so the obvious way to sort them is to convert to three 
numbers. The first and last numbers are easy, you just use the int() function, 
the roman number is a bit trickier because Python doesn't have a built-in 
converter.


So here is my converter, and a decorate function that uses it:

def from_roman(s):
# Convert Roman numerals into an integer.
table = {'I': 1, 'II': 2, 'III': 3, 'IV': 4, 'V': 5, 'VI': 6,
 'VII': 7, 'VIII': 8, 'IX': 9, 'X': 10}  # Is this enough?
return table[s.upper()]


def decorate(filename):
a, b, c = filename.split(".")  # Split into three pieces, at the dots.
a = int(a)  # Convert the first and last into integers.
c = int(c)
b = from_roman(b)  # and the middle using roman numerals
return (a, b, c)



And finally you can do the sorting like so:


files = sorted(os.listdir(location), key=decorate)


Note that Python will do the undecorate part automatically.

Warning: I have not tested any of this. It should work, but it's not 
unpossible for me to have make a misteak.




--
Steven

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[Tutor] New user Knows nothing about python I Need HELP

[William Stewart]

hello
I am trying to make a math functions program which includes
ADDITION: 2+2=4
SUBTRACTION: 4-2=2
MULTIPLICATION: 4*2=8
DIVISION: 4/2=2 
EXPONENT: 2**3=8
REMAINDER: 5%2=1

I have no Idea how to start this task I have never used ANY programming 
programs before And I dont Know the language either
The online help files from python Did not help a bit
please help
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Re: [Tutor] New user Knows nothing about python I Need HELP

[Jerry Hill]

On Mon, Jan 30, 2012 at 2:02 PM, William Stewart
 wrote:
> I have no Idea how to start this task I have never used ANY programming 
> programs before And I dont Know the language either
> The online help files from python Did not help a bit


Here's a few resources that might get you started.

First, if you haven't seen it, I found the official python tutorial to
be a great place to start: http://docs.python.org/tutorial/  That may
assume more familiarity with programming in general than you are
comfortable with, though.

In that case, you might be interested in a whole bunch of resources
designed to teach python to people who haven't done any programming at
all: http://wiki.python.org/moin/BeginnersGuide/NonProgrammers

Once you're a bit more comfortable, there are a ton more documentation
aimed at learning python for people who are already somewhat familiar
with other programming languages:
http://wiki.python.org/moin/BeginnersGuide/Programmers

Hope that helps some,
Jerry
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Re: [Tutor] New user Knows nothing about python I Need HELP

[Joel Goldstick]

On Mon, Jan 30, 2012 at 2:21 PM, Jerry Hill  wrote:
> On Mon, Jan 30, 2012 at 2:02 PM, William Stewart
>  wrote:
>> I have no Idea how to start this task I have never used ANY programming 
>> programs before And I dont Know the language either
>> The online help files from python Did not help a bit
>
>
> Here's a few resources that might get you started.
>
> First, if you haven't seen it, I found the official python tutorial to
> be a great place to start: http://docs.python.org/tutorial/  That may
> assume more familiarity with programming in general than you are
> comfortable with, though.
>
> In that case, you might be interested in a whole bunch of resources
> designed to teach python to people who haven't done any programming at
> all: http://wiki.python.org/moin/BeginnersGuide/NonProgrammers
>
> Once you're a bit more comfortable, there are a ton more documentation
> aimed at learning python for people who are already somewhat familiar
> with other programming languages:
> http://wiki.python.org/moin/BeginnersGuide/Programmers
>
> Hope that helps some,
> Jerry
> ___
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From the nature of your question, I am guessing you are taking a class
and this is homework?  If so, can you tell us what you have learned so
far or what topics have been covered in your class?

If this just for general interest.  the resources above are a good start


-- 
Joel Goldstick
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Re: [Tutor] New user Knows nothing about python I Need HELP

[Joel Goldstick]

On Mon, Jan 30, 2012 at 5:41 PM, William Stewart  wrote:

> thanks I havent learned anything about prgramming its a computer sicence
> class, I will try  the links
> thanks again
>
> --- On *Mon, 1/30/12, Joel Goldstick * wrote:
>
>
> From: Joel Goldstick 
> Subject: Re: [Tutor] New user Knows nothing about python I Need HELP
> To: "Jerry Hill" 
> Cc: "William Stewart" , tutor@python.org
> Date: Monday, January 30, 2012, 3:00 PM
>
>
> On Mon, Jan 30, 2012 at 2:21 PM, Jerry Hill 
> http://ca.mc886.mail.yahoo.com/mc/compose?to=malaclyp...@gmail.com>>
> wrote:
> > On Mon, Jan 30, 2012 at 2:02 PM, William Stewart
> > http://ca.mc886.mail.yahoo.com/mc/compose?to=williamjstew...@rogers.com>>
> wrote:
> >> I have no Idea how to start this task I have never used ANY programming
> programs before And I dont Know the language either
> >> The online help files from python Did not help a bit
> >
> >
> > Here's a few resources that might get you started.
> >
> > First, if you haven't seen it, I found the official python tutorial to
> > be a great place to start: http://docs.python.org/tutorial/  That may
> > assume more familiarity with programming in general than you are
> > comfortable with, though.
> >
> > In that case, you might be interested in a whole bunch of resources
> > designed to teach python to people who haven't done any programming at
> > all: http://wiki.python.org/moin/BeginnersGuide/NonProgrammers
> >
> > Once you're a bit more comfortable, there are a ton more documentation
> > aimed at learning python for people who are already somewhat familiar
> > with other programming languages:
> > http://wiki.python.org/moin/BeginnersGuide/Programmers
> >
> > Hope that helps some,
> > Jerry
> > ___
> > Tutor maillist  -  
> > Tutor@python.org
> > To unsubscribe or change subscription options:
> > http://mail.python.org/mailman/listinfo/tutor
>
> From the nature of your question, I am guessing you are taking a class
> and this is homework?  If so, can you tell us what you have learned so
> far or what topics have been covered in your class?
>
> If this just for general interest.  the resources above are a good start
>
>
> --
> Joel Goldstick
>
> William,

First, reply to all so that the group sees your response.  Second, aside
from the reading, find a classmate or two who are feeling like you are.

python has an interactive shell that you get to by just typing python from
a terminal prompt.  When you go through a tutorial or examples, try things
out in the shell.  You'll learn a lot that way


-- 
Joel Goldstick
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[Tutor] ASCII Conversion

[Michael Lewis]

I am trying to do a simple test but am not sure how to get around ASCII
conversion of characters. I want to pass in y have the function test to see
if y is an integer and print out a value if that integer satisfies the if
statement. However, if I pass in a string, it's converted to ASCII and will
still satisfy the if statement and print out value. How do I ensure that a
string is caught as a ValueError instead of being converted?

def TestY(y):
try:
y = int(y)
except ValueError:
pass
if y < -1 or y > 1:
value = 82
print value
else:
pass

-- 
Michael J. Lewis

mjole...@gmail.com
415.815.7257
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Re: [Tutor] ASCII Conversion

[David Kidd]

On Tue, Jan 31, 2012 at 15:50, Michael Lewis  wrote:
> ... However, if I pass in a string, it's converted to ASCII and will
> still satisfy the if statement and print out value. How do I ensure that a
> string is caught as a ValueError instead of being converted?

It depends on what you want to do if you catch a string. If you just
want to end the function, you could just try returning on the
exception, rather than passing. This will stop the string from being
processed any further.
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Re: [Tutor] ASCII Conversion

[Christian Witts]

On 2012/01/31 06:50 AM, Michael Lewis wrote:
I am trying to do a simple test but am not sure how to get around 
ASCII conversion of characters. I want to pass in y have the function 
test to see if y is an integer and print out a value if that integer 
satisfies the if statement. However, if I pass in a string, it's 
converted to ASCII and will still satisfy the if statement and print 
out value. How do I ensure that a string is caught as a ValueError 
instead of being converted?


def TestY(y):
try:
y = int(y)
except ValueError:
pass
if y < -1 or y > 1:
value = 82
print value
else:
pass

--
Michael J. Lewis
mjole...@gmail.com 
415.815.7257



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If you just want to test if `y` is an integer you can do so with 
`type(y) == int`, and to get the ASCII value of a character you can use 
`ord` like `ord('a') == 97`. And how to avoid your ValueError with a bad 
conversion, do your type checking before hand.


Hope that helps.
--

Christian Witts
Python Developer
//
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Re: [Tutor] ASCII Conversion

[Blockheads Oi Oi]

On 31/01/2012 05:33, Christian Witts wrote:

On 2012/01/31 06:50 AM, Michael Lewis wrote:

I am trying to do a simple test but am not sure how to get around
ASCII conversion of characters. I want to pass in y have the function
test to see if y is an integer and print out a value if that integer
satisfies the if statement. However, if I pass in a string, it's
converted to ASCII and will still satisfy the if statement and print
out value. How do I ensure that a string is caught as a ValueError
instead of being converted?

def TestY(y):
try:
y = int(y)
except ValueError:
pass
if y < -1 or y > 1:
value = 82
print value
else:
pass

--
Michael J. Lewis
mjole...@gmail.com 
415.815.7257



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If you just want to test if `y` is an integer you can do so with
`type(y) == int`, and to get the ASCII value of a character you can use
`ord` like `ord('a') == 97`. And how to avoid your ValueError with a bad
conversion, do your type checking before hand.

Hope that helps.
--

Christian Witts
Python Developer
//



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The test of y would not normally be written as it is, comparisons can be 
chained see http://docs.python.org/reference/expressions.html#not-in.
Also Python tends to use EAFP rather than LBYL see 
http://docs.python.org/glossary.html.


--
Cheers.

Mark Lawrence.

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Re: [Tutor] ASCII Conversion

[Peter Otten]

Michael Lewis wrote:

> I am trying to do a simple test but am not sure how to get around ASCII
> conversion of characters. I want to pass in y have the function test to
> see if y is an integer and print out a value if that integer satisfies the
> if statement. However, if I pass in a string, it's converted to ASCII and
> will still satisfy the if statement and print out value. How do I ensure
> that a string is caught as a ValueError instead of being converted?
> 
> def TestY(y):
> try:
> y = int(y)
> except ValueError:
> pass
> if y < -1 or y > 1:
> value = 82
> print value
> else:
> pass

You have to remember somehow whether you have an integer or a string. A 
straightforward way is

def test(y):
try:
y = int(y)
isint = True 
except ValueError:
isint = False
if isint and y < -1 or y > 1:
print 82


However, Python's try..except statement features an else suite that is only 
invoked when no exception is raised. So the idiomatic way is to drop the 
helper variable and change the control flow instead:

def test(y):
try:
y = int(y)
except ValueError:
pass
else:
if y < -1 or y > 1:
print 82

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Re: [Tutor] ASCII Conversion

[Peter Otten]

Peter Otten wrote:

> if isint and y < -1 or y > 1:
 
Sorry, I forgot the parentheses.

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