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From: MRAB on 10 Apr 2010 11:04
alex23 wrote:
> On Apr 9, 8:52 am, Ben Racine <i3enha...(a)gmail.com> wrote:
>> I have a list...
>> ['dir_0_error.dat', 'dir_120_error.dat', 'dir_30_error.dat', 'dir_330_error.dat']
>> I want to sort it based upon the numerical value only.
>> Does someone have an elegant solution to this?
>
> This approach doesn't rely on knowing the format of the string:
>
>>>> from string import maketrans, letters, punctuation
>>>> a = ['dir_0_error.dat', 'dir_120_error.dat', 'dir_30_error.dat', 'dir_330_error.dat']
>>>> def only_numbers(s):
> ... nums = s.translate(None, letters+punctuation)
> ... return int(nums)
> ...
>>>> a.sort(key=only_numbers)
>>>> a
> ['dir_0_error.dat', 'dir_30_error.dat', 'dir_120_error.dat',
> 'dir_330_error.dat']
>
> If you're using Python 3.x, the string module has been removed, so you
> can find the maketrans function on str there.

The string module still exists in Python 3.x, but the string functions
which have been superseded by string methods have been removed.
From: alex23 on 10 Apr 2010 11:20
MRAB <pyt...(a)mrabarnett.plus.com> wrote:
> The string module still exists in Python 3.x, but the string functions
> which have been superseded by string methods have been removed.

Awesome, thanks for the heads up.
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