[Tutor] OT: supporting Python & the PSF with a half/quarter-page ad?

Hey everyone, This is somewhat off-topic for this list, but if you've gotten a lot out of Python and want to contribute, the Python Software Foundation is advocating for the language by creating and distributing a brochurethat talks all about the goodness of Python

Re: [Tutor] Editing values from a dictionary

On Wed, Feb 26, 2014 at 05:09:49PM +, Bob Williams wrote: > -BEGIN PGP SIGNED MESSAGE- > Hash: SHA1 > > Hi List, > > I have two problems, but it's possible that one solution will suffice. > I am using a module called mutagen to extract audio metadata from > .flac files. The output of

Re: [Tutor] os.symlink can't find target

On 26Feb2014 15:41, Bob Williams wrote: > Many thanks for your helpful comments. I do still have some problems > with my script, but it's probably better to start a new thread with an > appropriate subject. Very true. > I'm a bit new to Python, so it still seems like magic sometimes > (someone e

Re: [Tutor] os.symlink can't find target

-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On 26/02/14 15:41, Bob Williams wrote: On 26/02/14 05:31, Cameron Simpson wrote: >>> linkName1 = pathList[j][0:-3] + "mp3" >>> >>> Isn't this exactly the same as pathList[j] ? >>> > Actually, no. Actually, you are right. I've trimmed down that block

Re: [Tutor] os.symlink can't find target

Bob Williams Wrote in message: > >>> linkName1 = pathList[j][0:-3] + "mp3" >> >> Isn't this exactly the same as pathList[j] ? >> > Actually, no. pathList[j] can contain either .mp3 files or .flac > files. In fact the main function of the script is to run all the flacs > through lame to conver

Re: [Tutor] viewkeys,viewvalues,viewitems : Use Cases

Santosh Kumar Wrote in message: > want to understand about where to use , viewkeys() viewvalues() viewitems() .. Sometimes you want to loop through a dict, doing something with each of the items. For example you want to generate a report. Suppose you have a dict where the key

Re: [Tutor] viewkeys,viewvalues,viewitems : Use Cases

I want to understand about where to use , viewkeys() viewvalues() viewitems() Thanks, santosh On Wed, Feb 26, 2014 at 6:59 PM, Alan Gauld wrote: > On 26/02/14 07:04, Santosh Kumar wrote: > > I defined a dictionary a below. >> >> In [14]: a = {'a':1,'b':2,'c':3} >> ... >> >> Funtion associated

Re: [Tutor] calling global in funtions.

Thank you all. I understood the global function now. On Wed, Feb 26, 2014 at 7:42 PM, eryksun wrote: > On Wed, Feb 26, 2014 at 8:45 AM, Steven D'Aprano > wrote: > >> :4: SyntaxWarning: name 'a' is assigned to before global > declaration > > > > This is just a warning. It is STRONGLY RECOMMENDE

Re: [Tutor] Editing values from a dictionary

-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On 26/02/14 17:29, Ben Finney wrote: > Bob Williams writes: > >> In [3]: print metadata["artist"] [u'The Incredible String Band'] >> >> I now want to pass that string to another program, but I want to >> strip off the leading [u' and the trailing ']

Re: [Tutor] Editing values from a dictionary

Hi Bob, >>> In [3]: print metadata["artist"] [u'The Incredible String Band'] <<< Here u' and ' is not something you can strip off as it is part of python datatype called UNICODE. Python prints a word or sentence in double or singles quotes when it is a STRING or UNICODE in interpreter. These are

Re: [Tutor] Editing values from a dictionary

Bob Williams writes: > In [3]: print metadata["artist"] > [u'The Incredible String Band'] > > I now want to pass that string to another program, but I want to strip > off the leading [u' and the trailing ']. You may be assuming that ‘metadata["artist"]’ is a text string; I suspect it is not. Tr

[Tutor] Editing values from a dictionary

-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi List, I have two problems, but it's possible that one solution will suffice. I am using a module called mutagen to extract audio metadata from .flac files. The output of mutagen is in the form of a dictionary, so In [1]: import mutagen.flac In [2

Re: [Tutor] os.symlink can't find target

-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi Cameron, Many thanks for your helpful comments. I do still have some problems with my script, but it's probably better to start a new thread with an appropriate subject. I'm a bit new to Python, so it still seems like magic sometimes (someone else

Re: [Tutor] calling global in funtions.

On Wed, Feb 26, 2014 at 8:45 AM, Steven D'Aprano wrote: >> :4: SyntaxWarning: name 'a' is assigned to before global declaration > > This is just a warning. It is STRONGLY RECOMMENDED that you put the > global declaration at the top of the function, but it is not compulsary. > If you put it somewhe

Re: [Tutor] subprocess.call list vs. str argument

On 26 February 2014 08:50, Albert-Jan Roskam wrote: > > Yesterday evening (it was *late* so forgive me if I wrong) I realized that > part of my confusion was also caused by the fact that I ran my code in Idle. > If I called subprocess.call with a list argument, it returned code 0 > (success) bu

Re: [Tutor] When to use multiprocessing Managers?

2014-02-25 11:52 GMT+01:00 James Chapman : > Hello tutors > > I'm curious about managers and when to use them. > For example, I see they offer a Queue() for sharing a Q between > processes, but if I create a Q in the parent process and pass it down > to child processes, then they can put messages i

Re: [Tutor] calling global in funtions.

On Wed, Feb 26, 2014 at 12:42:00PM +0530, Santosh Kumar wrote: > All, > > Requirement : i want to call a variable assigned outside a function scope > anytime within the function. I read "global" is a way. You can *read* the value of a global from inside a function without needing to declare it a

Re: [Tutor] calling global in funtions.

On 26/02/14 07:12, Santosh Kumar wrote: All, Requirement : i want to call a variable assigned outside a function scope anytime within the function. call in Python means something very specific, namey that you put parens after the name and that hopefully results in some code being executed. Y

Re: [Tutor] viewkeys,viewvalues,viewitems : Use Cases

On 26/02/14 07:04, Santosh Kumar wrote: I defined a dictionary a below. In [14]: a = {'a':1,'b':2,'c':3} ... Funtion associated with dictionaries. In [11]: print a.viewkeys() dict_keys(['a', 'c', 'b']) In [12]: print a.viewvalues() dict_values([1, 3, 2]) In [13]: print a.viewitems() dict_ite

Re: [Tutor] subprocess.call list vs. str argument

On Wed, Feb 26, 2014 at 3:50 AM, Albert-Jan Roskam wrote: > On Tue, Feb 25, 2014 at 4:54 PM, Dave Angel wrote: >> CreateProcess has its own design bobbles as well. For >> example, if you forget to put quotes around the program >> name, it will happily try to add ".exe" to *multiple* >> places in

Re: [Tutor] next element in list

David, Peter roger that and thanks so much!! On Wed, Feb 26, 2014 at 1:29 PM, Peter Otten <__pete...@web.de> wrote: > rahmad akbar wrote: > > > hey guys > > > > i have this file i wish to parse, the file looks something like bellow. > > there are only four entry here (AaaI, AacLI, AaeI, AagI).

Re: [Tutor] next element in list

rahmad akbar wrote: > hey guys > > i have this file i wish to parse, the file looks something like bellow. > there are only four entry here (AaaI, AacLI, AaeI, AagI). the complete > file contains thousands of entries > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= >

Re: [Tutor] os.symlink can't find target

On 26 February 2014 16:31, Cameron Simpson wrote: > > You need to know that ENOENT is errno 2 "No such file or directory", > but it helps. In case it helps anyone, there is information in the python documentation of the errno module that associates system error numbers with their corresponding me

Re: [Tutor] calling global in funtions.

Santosh Kumar Wrote in message: > Requirement : i want to call a variable assigned outside a function scope anytime > within the function. I read "global" is a way. > Your sample code doesn't do any calling. But if your design requires you to assign to a global from inside a function, t

Re: [Tutor] next element in list

rahmad akbar Wrote in message: > > then i realized i couldn't do something like .next() to the var in_file which is a list. so i added a flag start = False in which will be turned to True upon 'Rich Roberts' found. is the any simpler way to move to the next element in the list. like built in

[Tutor] next element in list

hey guys i have this file i wish to parse, the file looks something like bellow. there are only four entry here (AaaI, AacLI, AaeI, AagI). the complete file contains thousands of entries =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= REBASE, The Restriction Enzyme Dat

Re: [Tutor] Responding Tweet: A Twitter Bot

On Fri, Feb 21, 2014 at 4:05 PM, Walter Prins wrote: > > With the caveat that I'm not familiar with the Twitter streaming API's > and that I literally only spend 3 minutes googling this, it seems to > me to be the case that the Twitter streaming API's is intended to be a > push style notification

Re: [Tutor] subprocess.call list vs. str argument

Regards, Albert-Jan ~~ All right, but apart from the sanitation, the medicine, education, wine, public order, irrigation, roads, a fresh water system, and public health, what have the Romans ever done for us?

Re: [Tutor] os.symlink can't find target

Hi Bob, I notice your problem is solved, but I've got a few remarks about your script and also how you might have investigated your problem. First: the os.foo calls are usually very thin wrappers for the corresponding OS call. So if you get an errno type error for os.symlink, it is worth running: