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RE: What sort of data structure to use?

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  RE: What sort of data structure to use? David Aldrich <David.Aldrich@EMEA.NEC.COM> - 2015-06-03 11:07 +0000

#91949 — RE: What sort of data structure to use?

Thanks very much for all the answers given to my question. They help me to think about the problem pythonically.

Best regards

David

> -----Original Message-----
> From: Python-list [mailto:python-list-
> bounces+david.aldrich=emea.nec.com@python.org] On Behalf Of Peter
> Otten
> Sent: 03 June 2015 11:59
> To: python-list@python.org
> Subject: Re: What sort of data structure to use?
> 
> David Aldrich wrote:
> 
> > Hi
> >
> > I have written a Python utility that performs a certain activity on
> > some predefined sets of files.  Here is the outline of what I have written:
> >
> > # File Set A
> > pathA = 'pathA'
> > fileListA = ['fileA1.txt', 'fileA2.txt']
> >
> > # File Set B
> > pathB = 'pathB'
> > fileListB = ['fileB1.txt', 'fileB2.txt', 'fileB3.txt']
> >
> > myFunc1(pathA, fileListA)
> > myFunc2(pathA, fileListA)
> >
> > myFunc1(pathB, fileListB)
> > myFunc2(pathB, fileListB)
> >
> > I want to add more file sets, so I really want to add the sets to a
> > list and iterate over the list, calling myFunc1 & myFunc2 for each item.
> >
> > My question is: what sort of data structure could I use to organise
> > this, given that I want to associate a set of files with each path and
> > that, for each set, there is an arbitrary number of files?
> 
> I'd start simple and put (path, files) pairs into a list:
> 
> path_files_pairs = [
>     ("pathA", ["fileA1.txt", "fileA2.txt", ...]),
>     ("pathB", ["fileB1.txt", ...]),
> ]
> 
> for path, files in path_files_pairs:
>     func1(path, files)
>     func2(path, files)
> 
> You can always add complications later:
> 
> import glob
> import os
> 
> class VirtualFileset:
>     def __init__(self, folder, pattern):
>         self.folder = folder
>         self.pattern = pattern
>     def __iter__(self):
>         yield self.folder
>         yield glob.glob(os.path.join(self.folder, self.pattern))
> 
> path_files_pairs = [
>     ("pathA", ["fileA1.txt", "fileA2.txt", ...]),
>     ("pathB", ["fileB1.txt", ...]),
>     VirtualFileset("pathC", "*.py"), # all python files in directory "pathC"
> ]
> 
> for path, files in path_files_pairs:
>     func1(path, files)
>     func2(path, files)
> 
> 
> --
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