Re: [Tutor] FW: wierd replace problem
> Date: Tue, 14 Sep 2010 22:15:40 +0100
> From: wpr...@gmail.com
> To: tutor@python.org
> Subject: Re: [Tutor] FW: wierd replace problem
>
>
>
> On 14 September 2010 21:10, Roelof Wobben
>> wrote:
> I understand it but I try to understand why in a file there is this
> 'word python makes a "'word.
>
> Python doesn't change what it reads from the file. However, depending
> on how you ask Python to tell you what it's read (or what the contents
> of a string variable is), it might display it quoted, and/or include
> escape charaters, or not as the case may be. If what you've read from
> the file contains quotes, then obviously you need to be careful to not
> mistake Python's quoting of the value of a string as being *part* of
> that string. Neither must you mistake the escape character (if
> applicable) from being actually part of the string.
>
> For example, consider the following exchange in the Python shell
> (please try all of this yourself and experiment):
>
s = 'blah'
s
> 'blah'
print s
> blah
>
> I assign the value of 'blah' to the string s. So far simple enough.
> Obviosuly the quotes used int the assignment of the string does not
> form part of the string itself. Their utility is only to delineate to
> Python the start of the string, and the end of the string.
>
> In the next line I ask Python to evaluate the expression s, which it
> duly reporst as 'blah'. Again, it's using normal Python convention to
> format the data as a string, because that's what s is, a string
> object. But the quotes are formatting, they're not really part of the
> string.
>
> In the next line I ask Python to print s. Now, the true content of s
> is printed as it is, and hence you can see that the quotes are not part
> of the string.
>
> Now consider the following exchange in the Python shell where I open a
> file and write some text to it to prove this point:
f = open('test.txt', 'w+')
f.write('blah')
f.close()
import os
os.system('notepad test.txt')
>
> The last line above opens the text file test.txt in Notepad so you can
> see the contents. As you can see, no quotes or anything else. Now,
> while open, suppose we put a single quote in the file, so it reads:
> 'blah
> ...and suppose we then save it and exit notepad so you're back in the
> Python shell. Then we do:
>
f=open('test.txt','r+')
s=f.read()
f.close()
s
> "'blah"
>
> Now I've read the contents of the file back into a string variable s,
> and asked Python to evaluate (output) this string object.
>
> Notice, Python is now formatting the string with *doube* quotes
> (previously it defaulted to single quotes) to avoid having to escape
> the single quote that forms part of the string. If Python had used
> single quotes instead, then there would've been an ambiguity with the
> single quote that's part of the string and so it would've had to escape
> that too. So consequently it formats the string with double quotes,
> which is valid Python syntax and avoids the backslash. (Stating the
> obvious, strings can be quoted with double or single quotes.) As
> before, the double quotes, as with the single quotes earlier, are not
> part of the string. They are merely formatting since Python is being
> asked to display a string and hence it must indicate the start and end
> of the string with suitable quote characters.
>
> Now, as before do:
>
print s
> 'blah
>
> As before, with print you see the contents of the string as it is (and
> as indeed it is also in the file that you saved). Just the single quote
> you added at the front of Blah. No double or single quotes or anything
> else.
>
> Now finally, let's try something a bit more elaborate. Do again:
>
os.system('notepad test.txt')
>
> Then put into the file the following 2 lines of text (notice the file
> now contains 2 lines, and both single and double quotes...):
> +++"+++This line is double quoted in the file and the quotes have +
> symbols around them.+++"+++
> ---'---This line is single quoted in the file and the quotes have -
> symbols around them.---'---
>
> Save it, exit Notepad, then do:
f=open('test.txt', 'r+')
s=f.read()
f.close()
s
> '+++"+++This line is double quoted in the file and the quotes have +
> symbols around them.+++"+++\n---\'---This line is single quoted in the
> file and the quotes have - symbols around them.---\'---\n'
print s
> +++"+++This line is double quoted in the file and the quotes have +
> symbols around them.+++"+++
> ---'---This line is single quoted in the file and the quotes have -
> symbols around them.---'---
>
> Notice we read both lines in the file into one single string. See how
> Python formats that as a string object, and escapes not only the single
> quotes but also the line break characters (\n). See also when Python
> is asked to "print" the string, you can see the escape characters
> really there. See what's happened? Do you understand why?
>
> W
[Tutor] what happened to the cards module
I downloaded Python 2.6.6 for windows but I can't access the "Cards" module for playing card games. Did it get renamed? If so, how can I find it? Thanks. John Soares jsoa...@safe-mail.net ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] list dll functions ?
Dependdencyy walker is a good tool, but as you have seen it doesn't give you function's signature. If you explore a MS dll, you should to have a look at MSDN and read about the function description. A bit out of subject : There is no way to find the function's signature only from exploring the binary file (I never found one at least). Following article explain the MS PE (Portable Executable, no elf format in Windows), but it doesn't explain more about signature. this is why you need headers and lib file to link a w32 app. http://msdn.microsoft.com/en-us/library/ms809762.aspx ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] what happened to the cards module
> I downloaded Python 2.6.6 for windows but I can't access the "Cards" module > for playing card games. > > Did it get renamed? If so, how can I find it? I don't think there's a Cards module in the standard library. At least, I've never seen it, nor can I find any mention about it on the python documentation page. Probably this is a module you installed yourself later on, and is now only accessible for your previous Python version? You would have to reinstall it for Python 2.6. How did you previously use Cards? What Python version. Btw, I don't know what your upgrade path is, but can't you go to Python 2.7 directly? Evert ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how best to implement paginated data in CLI
"Rance Hall" wrote In reviewing the app I'm hoping to replace I found the size of the client list is under 100 records. Given this new information, do you still think that db cursors is the way to go? Using the cursor is a more scaleable solution but if you are sure you only ever have 100 or so rows then I agree that sing a local client side windowing scheme may be as effective. Using the cursor should not be onerous however, it should look something like: configure cursor page size for each page in cursor display screen process data The only downside is, as you say that you are now dipping into the cursor for every 10 records which would be a lot of network traffic. I'd expect the "induistrial" solution to this to be something like set cursor to 100 records (or even 1000 depending on size) for each page in cursor for each screen in page display screen process data So if you are sure you will only ever have about 100 records you can omit the cursor paging. -- Alan Gauld Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] list dll functions?
"Alex Hall" wrote Out of curiosity: I know I can call dll functions from python using the win32 lib, but is there any way to simply "examine" a loaded dll to see all of the functions and attributes it exposes for use? There are various tools around to do that and hopefully some documentation! But often nowadays DLLs expose a COM object model and you have a COM browser built into Pythonwin. That will give you a windows explorer type view of the objects and their operations. If the DLL is purely perocedural then that won't help. HTH, -- Alan Gauld Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Writing to Sound
"Corey Richardson" wrote First off, here is what I'm doing. I'm taking pi (3.141592 etc. etc. etc.), taking two values at a time, and then mapping the two values to pitch and length. I'm then using winsound.Beep to beep for x ms, at y frequency. So far I understand. What I want to do, is write that to file. Write what? The sound generated by Beep or the data used to drive Beep? Judging from http://codingmess.blogspot.com/2008/07/how-to-make-simple-wav-file-with-python.html, it seems to be more complex than I care to undertake without exploring the possibilities. That tells you how to make a wav file that will play in any standard media player program. Is that what you want? Are there any simpler or higher level ways? It depends what you want the file to be. What do you intend to do with the file? wouldn't mind something like sound_file.write(freq, length) like Beep does, but that may or may not exist. You can write the two values to a file so that you can read it back later and send the values to Beep. Thats trivial. But the file will not play in a standard player. I dunno, a simple google doesn't yield anything. That probably depends on what you are searching for. I'm not clear from your description what you want to do. -- Alan Gauld Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] what happened to the cards module
On Wed, 15 Sep 2010 10:09:25 am jsoa...@safe-mail.net wrote: > I downloaded Python 2.6.6 for windows but I can't access the "Cards" > module for playing card games. There is no "Cards" module in the standard library. You'll need to go back to wherever you found it in the first place. Google might help. -- Steven D'Aprano ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] selecting elements from dictionary
On Wed, 15 Sep 2010 12:10:59 pm Hs Hs wrote: > I want to print only those items that have [1,2] and [1,3] in any > order, such as [1,2] or [2,1], [3,1] or [1,3] > > >>> for item in xdic.keys(): > > ... if [1,2] in xdic[item]: > ... print item > > I get a wrong answer, That's because you ask the wrong question. [1,2] in xdic[item] doesn't check to see if 1 is in the list, then if 2 is in the list. It looks to see if one of the items is *exactly* [1,2]. >>> [1,2] in [1,2,3,4] False >>> [1,2] in [1,2,3,4, [1,2]] True > I know the values are there. How can I print > only those item that have [1,2] and [1,3] for key, value in xdic.items(): if 1 in value and 2 in value or 3 in value: print key -- Steven D'Aprano ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] intercepting and recored I/O function calls
Hello Tutor I would like to intercept and record I/O function calls to a file.. (later to a database) with probably the names of the files that have been created, accessed / deleted in my program. I have not done something like this before.. Some Guidance is highly appreciated Johnson ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] selecting elements from dictionary
Dear Steven,
Thanks for your help.
however I have a question,
using:
for key, value in xdic.items():
if 1 in value and 2 in value or 3 in value:
print key
also print keys that have values such as [1,2,3].
In cases where there is [1,2,3] and [1,2] also reported.
How can I extract those keys that have values only [1,2] and [1,3] exclusively.
>>> xdic = {75796988: [1, 2, 3], 75797478: [1, 2, 3], 75797887:[1,2],
>>>75797987:[3,1]}
>>> for key, value in xdic.items():
... if 1 in value and 2 in value or 3 in value:
... print key
...
75797987
75796988
75797478
75797887
Here all 4 keys appear. Instead I want to get only 75797887:[1,2] and
75797987:[3,1]
how can I force this.
thanks again.
From: Steven D'Aprano
To: tutor@python.org
Sent: Wed, September 15, 2010 7:27:05 AM
Subject: Re: [Tutor] selecting elements from dictionary
On Wed, 15 Sep 2010 12:10:59 pm Hs Hs wrote:
> I want to print only those items that have [1,2] and [1,3] in any
> order, such as [1,2] or [2,1], [3,1] or [1,3]
>
> >>> for item in xdic.keys():
>
> ... if [1,2] in xdic[item]:
> ... print item
>
> I get a wrong answer,
That's because you ask the wrong question.
[1,2] in xdic[item] doesn't check to see if 1 is in the list, then if 2
is in the list. It looks to see if one of the items is *exactly* [1,2].
>>> [1,2] in [1,2,3,4]
False
>>> [1,2] in [1,2,3,4, [1,2]]
True
> I know the values are there. How can I print
> only those item that have [1,2] and [1,3]
for key, value in xdic.items():
if 1 in value and 2 in value or 3 in value:
print key
--
Steven D'Aprano
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Re: [Tutor] selecting elements from dictionary
> using:
>
> for key, value in xdic.items():
> if 1 in value and 2 in value or 3 in value:
> print key
>
>
> also print keys that have values such as [1,2,3].
>
> In cases where there is [1,2,3] and [1,2] also reported.
>
> How can I extract those keys that have values only [1,2] and [1,3]
> exclusively.
If you know that elements in a list are unique (so only appear once), you may
want to look at using sets.
Evert
> >>> xdic = {75796988: [1, 2, 3], 75797478: [1, 2, 3], 75797887:[1,2],
> >>> 75797987:[3,1]}
> >>> for key, value in xdic.items():
> ... if 1 in value and 2 in value or 3 in value:
> ... print key
> ...
> 75797987
> 75796988
> 75797478
> 75797887
>
>
> Here all 4 keys appear. Instead I want to get only 75797887:[1,2] and
> 75797987:[3,1]
> how can I force this.
>
> thanks again.
>
>
>
>
>
> From: Steven D'Aprano
> To: tutor@python.org
> Sent: Wed, September 15, 2010 7:27:05 AM
> Subject: Re: [Tutor] selecting elements from dictionary
>
> On Wed, 15 Sep 2010 12:10:59 pm Hs Hs wrote:
>
> > I want to print only those items that have [1,2] and [1,3] in any
> > order, such as [1,2] or [2,1], [3,1] or [1,3]
> >
> > >>> for item in xdic.keys():
> >
> > ...if [1,2] in xdic[item]:
> > ...print item
> >
> > I get a wrong answer,
>
> That's because you ask the wrong question.
>
> [1,2] in xdic[item] doesn't check to see if 1 is in the list, then if 2
> is in the list. It looks to see if one of the items is *exactly* [1,2].
>
> >>> [1,2] in [1,2,3,4]
> False
> >>> [1,2] in [1,2,3,4, [1,2]]
> True
>
>
> > I know the values are there. How can I print
> > only those item that have [1,2] and [1,3]
>
> for key, value in xdic.items():
> if 1 in value and 2 in value or 3 in value:
> print key
>
>
>
>
> --
> Steven D'Aprano
> ___
> Tutor maillist - Tutor@python.org
> To unsubscribe or change subscription options:
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>
> ___
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Re: [Tutor] selecting elements from dictionary
On 15/09/10 15:31, Hs Hs wrote:
Dear Steven,
Thanks for your help.
however I have a question,
using:
for key, value in xdic.items():
if 1 in value and 2 in value or 3 in value:
print key
also print keys that have values such as [1,2,3].
In cases where there is [1,2,3] and [1,2] also reported.
How can I extract those keys that have values only [1,2] and [1,3]
exclusively.
>>> xdic = {75796988: [1, 2, 3], 75797478: [1, 2, 3], 75797887:[1,2],
75797987:[3,1]}
>>> for key, value in xdic.items():
... if 1 in value and 2 in value or 3 in value:
... print key
...
75797987
75796988
75797478
75797887
Here all 4 keys appear. Instead I want to get only 75797887:[1,2] and
75797987:[3,1]
how can I force this.
If you just have a few specific cases you can use "in" to check whether
the values you are interested in appear in a specified collection, ie:
>>> xdic = {75796988: [1, 2, 3], 75797478: [1, 2, 3], 75797887:[1,2],
75797987:[3,1]}
>>> for key, value in xdic.items():
... if value in ([1,2], [2,1], [1,3], [3,1]):
... print key
...
75797987
75797887
HTH
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Re: [Tutor] what happened to the cards module
> Hi Evert: > > I've been looking for a card playing framework for a long time. When I saw > "import Cards" and that he was shuffling, dealing cards, etc, I immediately > downloaded Python. Could this be available in Pygames? It depends where you "him" shuffling & dealing cards. Pygames doesn't exist, pygame does, but probably doesn't have what you're looking for. I do remember a set of questions on this list with a Cards example, but that was just some home-written code. You'll need to check the context of where you saw this, and if it's useful and usable to you. And I certainly don't know what you mean by a card playing framework: do you mean (library) code, which language, what "card game"? Evert > Thanks. > > John Soares > jsoa...@safe-mail.net > > Original Message > From: Evert Rol > To: jsoa...@safe-mail.net > Cc: tutor@python.org > Subject: Re: [Tutor] what happened to the cards module > Date: Wed, 15 Sep 2010 10:40:34 +0200 > >> I downloaded Python 2.6.6 for windows but I can't access the "Cards" module >> for playing card games. >> >> Did it get renamed? If so, how can I find it? > > I don't think there's a Cards module in the standard library. At least, I've > never seen it, nor can I find any mention about it on the python > documentation page. > > Probably this is a module you installed yourself later on, and is now only > accessible for your previous Python version? You would have to reinstall it > for Python 2.6. > How did you previously use Cards? What Python version. > > Btw, I don't know what your upgrade path is, but can't you go to Python 2.7 > directly? > > Evert ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Writing to Sound
-Original Message- From: Alan Gauld To: tutor Sent: Wed, Sep 15, 2010 5:26 am Subject: Re: [Tutor] Writing to Sound "Corey Richardson" wrote First off, here is what I'm doing. I'm taking pi (3.141592 etc. etc. etc.), taking two values at a time, and then mapping the two values to pitch and length. I'm then using winsound.Beep to beep for x ms, at y frequency. So far I understand. What I want to do, is write that to file. Write what? The sound generated by Beep or the data used to drive Beep? [snip] -- Alan Gauld Author of the Learn to Program web site http://www.alan-g.me.uk/ - I want to write the sound generated by Beep to file, or sound at the same pitch and length. Sorry that that wasn't clear ~Corey RIchardson ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] list dll functions?
Find the Pythonwin IDE executable and run it - its a better IDE than IDLE in my opinion, especially if you are on Windows. Once it is started you can go to the Tools->COM Browser menu item and it starts an explorer type Window. The top level "folders" are: Registered Objects Running Objects Registered Type Libraries You can then drill down and explore as you wish. For example under Registered Type Libraries there is Accessibility. Within that there is TypeLibrary-> IAccessible-Dispatch Within that there are functions such as AddRef, Invoke, GetTypeInfo etc. Inside those you can see the parameters etc. Alan Gauld Author of the Learn To Program website http://www.alan-g.me.uk/ - Original Message > From: Alex Hall > To: Alan Gauld > Sent: Wednesday, 15 September, 2010 15:57:43 > Subject: Re: [Tutor] list dll functions? > > On 9/15/10, Alan Gauld wrote: > > > > "Alex Hall" wrote > > > >> Out of curiosity: I know I can call dll functions from python using > >> the win32 lib, but is there any way to simply "examine" a loaded dll > >> to see all of the functions and attributes it exposes for use? > > > > There are various tools around to do that and hopefully some > > documentation! > > > > But often nowadays DLLs expose a COM object model and > > you have a COM browser built into Pythonwin. That will give > > you a windows explorer type view of the objects and their > > operations. > How would you go about doing that? I have the pywin extension > installed for my python installation. > > > > If the DLL is purely perocedural then that won't help. > > > > HTH, > > > > > > -- > > Alan Gauld > > Author of the Learn to Program web site > > http://www.alan-g.me.uk/ > > > > > > ___ > > Tutor maillist - Tutor@python.org > > To unsubscribe or change subscription options: > > http://mail.python.org/mailman/listinfo/tutor > > > > > -- > Have a great day, > Alex (msg sent from GMail website) > mehg...@gmail.com; http://www.facebook.com/mehgcap > ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] counting elements in list
Hi group:
I have a list:
k = ['T', 'C', 'T', 'T', 'T', 'T', 'T', 'T', 'T', 'C', 'T', 'T', 'T', 'C',
'T',
'T', 'T', 'C', 'C', 'T', 'T', 'T', 'C', 'T', 'T', 'T', 'T', 'T', 'T']
the allowed elements are A or T or G or C. List can have any number of A or T
or
G or C
My aim is to get a string ouput with counts of each type A or T or G or C.
A:0\tT:23\tG:0\tC:6
from the above example, I could count T and C and since there are no A and G, I
want to print 0 for them. I just dont know how this can be done.
>>> d = {}
>>> for i in set(k):
... d[i] = k.count(i)
...
>>> d
{'C': 6, 'T': 23}
>>> for keys,values in d.items():
... print keys+'\t'+str(d[keys])
...
C 6
T 23
the other way i tried is:
>>> k.count('A'),k.count('T'),k.count('G'),k.count('C')
(0, 23, 0, 6)
how can I get counts for those elements not represented in list and print
them. appreciate your help.
thanks
kumar
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Re: [Tutor] counting elements in list
On Wed, Sep 15, 2010 at 1:14 PM, kumar s wrote:
> Hi group:
>
> I have a list:
>
> k = ['T', 'C', 'T', 'T', 'T', 'T', 'T', 'T', 'T', 'C', 'T', 'T', 'T', 'C',
> 'T',
> 'T', 'T', 'C', 'C', 'T', 'T', 'T', 'C', 'T', 'T', 'T', 'T', 'T', 'T']
>
> the allowed elements are A or T or G or C. List can have any number of A or
> T or
> G or C
>
> My aim is to get a string ouput with counts of each type A or T or G or C.
>
> A:0\tT:23\tG:0\tC:6
>
> from the above example, I could count T and C and since there are no A and
> G, I
> want to print 0 for them. I just dont know how this can be done.
>
>>> k = ['T', 'C', 'T', 'T', 'T', 'T', 'T', 'T', 'T', 'C', 'T', 'T', 'T',
'C', 'T', 'T', 'T', 'C', 'C', 'T', 'T','T', 'C', 'T', 'T', 'T', 'T', 'T',
'T']
>>> "\t".join(x+":"+str(k.count(x)) for x in 'ATGC')
'A:0\tT:23\tG:0\tC:6'
>
>
>
>
> >>> d = {}
> >>> for i in set(k):
> ... d[i] = k.count(i)
> ...
> >>> d
> {'C': 6, 'T': 23}
>
>
> >>> for keys,values in d.items():
> ... print keys+'\t'+str(d[keys])
> ...
> C 6
> T 23
>
> the other way i tried is:
> >>> k.count('A'),k.count('T'),k.count('G'),k.count('C')
> (0, 23, 0, 6)
>
>
> how can I get counts for those elements not represented in list and print
> them. appreciate your help.
>
>
>
> thanks
> kumar
>
>
>
>
>
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--
~l0nwlf
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[Tutor] First complexity program
Hi. I try to make a program to connect my POS system with Geovision video server. I can connect directly with serial port but on the POS no have free serial. My POS can send information like file on video server. I can read this file with Python. It is first problem: My script can looking the directory every 10 second and if have new file can opens it but I think have better way to making it. Next problem is: If I send the data must open port but port is already open by Geovision. And second I must take data like input not like output. Every idea is welcome. Give me only guidelines. Who modules i can use and where can read some information. -- Григор Колев ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] First complexity program
On Wed, Sep 15, 2010 at 09:31:45PM +0300, Григор Колев wrote: > Hi. Hi, Grigoriy. > I try to make a program to connect my POS system with Geovision video > server. I can connect directly with serial port but on the POS no have > free serial. > My POS can send information like file on video server. > I can read this file with Python. > > It is first problem: > My script can looking the directory every 10 second and if have new file > can opens it but I think have better way to making it. For monitoring FS try to use pynotify library (http://pyinotify.sourceforge.net/). -- Please, use plain text message format contacting me, and don't use proprietary formats for attachments (such as DOC, XLS) use PDF, TXT, ODT, HTML instead. Thanks. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] counting elements in list
On Thu, 16 Sep 2010 03:23:01 am Shashwat Anand wrote:
> On Wed, Sep 15, 2010 at 1:14 PM, kumar s wrote:
> > Hi group:
> >
> > I have a list:
> >
> > k = ['T', 'C', 'T', 'T', 'T', 'T', 'T', 'T', 'T', 'C', 'T', 'T',
> > 'T', 'C', 'T',
> > 'T', 'T', 'C', 'C', 'T', 'T', 'T', 'C', 'T', 'T', 'T', 'T', 'T',
> > 'T']
> >
> > the allowed elements are A or T or G or C. List can have any number
> > of A or T or
> > G or C
> >
> > My aim is to get a string ouput with counts of each type A or T or
> > G or C.
> >
> > A:0\tT:23\tG:0\tC:6
> >
> > from the above example, I could count T and C and since there are
> > no A and G, I
> > want to print 0 for them. I just dont know how this can be done.
> >
> >>> k = ['T', 'C', 'T', 'T', 'T', 'T', 'T', 'T', 'T', 'C', 'T', 'T',
> >>> 'T',
>
> 'C', 'T', 'T', 'T', 'C', 'C', 'T', 'T','T', 'C', 'T', 'T', 'T', 'T',
> 'T', 'T']
>
> >>> "\t".join(x+":"+str(k.count(x)) for x in 'ATGC')
> 'A:0\tT:23\tG:0\tC:6'
Given the extremely low-level of knowledge which the Original Poster's
question reveals, I think a one-liner like that will probably look
completely cryptic and mysterious.
I suggest a simple modification of the OP's code:
d = {}
for i in set(k):
d[i] = k.count(i)
for key in 'ATGC':
print key + '\t' + str(d.get(key, 0))
--
Steven D'Aprano
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Re: [Tutor] intercepting and recored I/O function calls
"Jojo Mwebaze" wrote I would like to intercept and record I/O function calls to a file.. (later to a database) with probably the names of the files that have been created, accessed / deleted in my program. I have not done something like this before.. Some Guidance is highly appreciated Are you talking about I/O calls in your own app? If so thats fairly straightforward to do. OTOH If you are talking about capturing all I/O calls that's a lot harder and if it's a multi-user OS will need administrator privileges. But this is extremely dependant on the Operating System - you will basically have to intercept the system calls. So, which OS are you using? And how familiar are you with its API? Al;so, While you can probably do this in Python but its likely to have a serious impact on the OS performance, it will slow down the performamce quite noticeably. I'd normally recommend using C for something like this. HTH, -- Alan Gauld Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] How to get both 2.6 scripts as well as 3.1 scripts to run at command line?
64-bit Vista. I have no problem running 3.1 scripts at the command line. However 2.6 scripts seems to require 2.x. For example, I get this error showing that the old 2.x print won't do: C:\P26Working\Finished>solveCubicEquation.py File "C:\P26Working\Finished\solveCubicEquation.py", line 19 print "a is", a ^ SyntaxError: invalid syntax Dick Moores ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] How to get both 2.6 scripts as well as 3.1 scripts to run at command line?
print("a is", a)
or
from future import *
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Re: [Tutor] How to get both 2.6 scripts as well as 3.1 scripts to run at command line?
On Wed, Sep 15, 2010 at 10:35 PM, David Hutto wrote:
> print("a is", a)
> or
> from future import *
> ___
>
Other than the Python 3 style print function, what else is contained in the
future module?
--Bill
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Re: [Tutor] How to get both 2.6 scripts as well as 3.1 scripts to run at command line?
On Thu, Sep 16, 2010 at 12:02 AM, Bill Allen wrote:
>
>
> On Wed, Sep 15, 2010 at 10:35 PM, David Hutto wrote:
>>
>> print("a is", a)
>> or
>> from future import *
>> ___
>
> Other than the Python 3 style print function, what else is contained in the
> future module?
>>> import __future__
>>> help(__future__)
>
> --Bill
>
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[Tutor] working with empty lists
Im working on a little piece of test code to test an idea for a larger script.
Here is what I've got so far:
l = []
for i in range(0,10)
l.append(i)
for i in range(0,10)
print('%s. %s' % (i, l[i])
This gives me:
0. 0
1. 1
2. 2 etc
which is what I expect, but what I want is to get something like
0. 1
1. 2
2. 3 .
so that the output is clearly different on either side of the "."
I tried changing the append to l.append(i+1)
which almost worked but the output started with 1. 2 I was curious
what happend to the 0. 1 line
I know this means that I'm not understanding exactly what append actually does.
I know that my ide shows that the list as other functions like insert, etc.
Can someone explain to me whats the best way to add a value to a list
that is not long enough to accept it, without playing with the
indexes, it appears I currently am playing with them.
I know generally that we aren't supposed to care about the indexes but
this is eventually going to be part of a menuing system that displays
the index, so I do have a legit need to care about what is happening
to the list index.
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Re: [Tutor] How to get both 2.6 scripts as well as 3.1 scripts to run at command line?
On Wed, Sep 15, 2010 at 20:25, Richard D. Moores wrote: > 64-bit Vista. > > I have no problem running 3.1 scripts at the command line. However 2.6 > scripts seems to require 2.x. For example, I get this error showing that the > old 2.x print won't do: > > C:\P26Working\Finished>solveCubicEquation.py > File "C:\P26Working\Finished\solveCubicEquation.py", line 19 >print "a is", a >^ > SyntaxError: invalid syntax > > Dick Moores > Seems I was misunderstood. Some of the scripts written for 2.6 use libraries not yet available for 3.x. So I want to know not how to modify them, but how to run them at the command line. Dick ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] working with empty lists
On 9/16/2010 12:05 AM, Rance Hall wrote:
Im working on a little piece of test code to test an idea for a larger script.
Here is what I've got so far:
l = []
for i in range(0,10)
l.append(i)
for i in range(0,10)
print('%s. %s' % (i, l[i])
This gives me:
0. 0
1. 1
2. 2 etc
which is what I expect, but what I want is to get something like
0. 1
1. 2
2. 3 .
so that the output is clearly different on either side of the "."
I tried changing the append to l.append(i+1)
which almost worked but the output started with 1. 2 I was curious
what happend to the 0. 1 line
It works for me (after adding : at the end of the for statements, and a
parenthesis at the end of the print call).
>>> l = []
>>> for i in range(0,10)
...l.append(i+1)
...
>>> for i in range(0,10)
...print('%s. %s' % (i, l[i]))
...
0. 1
1. 2
2. 3
3. 4
etc.
[snip]
--
Bob Gailer
919-636-4239
Chapel Hill NC
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Re: [Tutor] How to get both 2.6 scripts as well as 3.1 scripts to run at command line?
On Thu, Sep 16, 2010 at 12:11 AM, Richard D. Moores wrote: > > > On Wed, Sep 15, 2010 at 20:25, Richard D. Moores wrote: >> >> 64-bit Vista. >> >> I have no problem running 3.1 scripts at the command line. However 2.6 >> scripts seems to require 2.x. For example, I get this error showing that the >> old 2.x print won't do: >> >> C:\P26Working\Finished>solveCubicEquation.py >> File "C:\P26Working\Finished\solveCubicEquation.py", line 19 >> print "a is", a >> ^ >> SyntaxError: invalid syntax >> >> Dick Moores > > Seems I was misunderstood. > > Some of the scripts written for 2.6 use libraries not yet available for 3.x. > So I want to know not how to modify them, but how to run them at the command > line. > > Dick > > ___ > Tutor maillist - tu...@python.org > To unsubscribe or change subscription options: > http://mail.python.org/mailman/listinfo/tutor > > I'm not experienced enough to have utilized all features but it does seem there would be a way to import and after a quick google search I think this might be the answer: http://docs.python.org/using/cmdline.html#envvar-PYTHONSTARTUP >From my brief review of it, it should call from future automatically in each interactive session I'll probably look further because it interests me as well. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
