Sorting a list

[Aaron Ginn]

I'm a python newbie, so please be kind! :)

I'm trying to sort a list.  Fairly simple, but I'm not getting
at all what I expect.  When I attempt to sort the list, the
return value is None, and I can't understand why at all.

Here's my code:

def get_files_in_directory( dir ):
    # Returns a list of files in a directory.

    print os.listdir(dir).sort()
    print os.listdir(dir)

    return os.listdir(dir).sort()

The directory 'dir' does exist.  From the docs, os.listdir() should
return a list of files in a directory, and sort() should sort
them, but here's the output from the two print statements:

None
['tsmc18_5lm.03.drc', 'tsmc18_5lm.04.drc', 'tsmc18_5lm.05.drc',
'tsmc18_5lm.06.drc', 'tsmc18_5lm.07.drc', 'tsmc18_5lm.08.drc',
'tsmc18_5lm.10.drc', 'tsmc18_5lm.01.drc', 'tsmc18_5lm.02.drc',
'tsmc18_5lm.09.drc']

Why is sort returning an empty list?


Thanks,
Aaron

-- 
Aaron J. Ginn

Opinions mine, not Motorola's