How do you sort files numerically?

by

This is called “natural sorting” or “human sorting” (as opposed to lexicographical sorting, which is the default). Ned B wrote up a quick version of one.

import re

def tryint(s):
    try:
        return int(s)
    except:
        return s

def alphanum_key(s):
    """ Turn a string into a list of string and number chunks.
        "z23a" -> ["z", 23, "a"]
    """
    return [ tryint(c) for c in re.split('([0-9]+)', s) ]

def sort_nicely(l):
    """ Sort the given list in the way that humans expect.
    """
    l.sort(key=alphanum_key)

It’s similar to what you’re doing, but perhaps a bit more generalized.

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