Python list sort alphanumerically.

sorted_alphanumeric.py

"""
Since os.listdir returns filenames in an arbitary order, 
this function is very handy for generating well-ordered filenames list. 
Credit: https://stackoverflow.com/questions/4813061/non-alphanumeric-list-order-from-os-listdir/48030307#48030307
"""
import re
def sorted_alphanumeric(data):
    convert = lambda text: int(text) if text.isdigit() else text.lower()
    alphanum_key = lambda key: [convert(c) for c in re.split('([0-9]+)', key)] 
    return sorted(data, key=alphanum_key)