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"""isort/natural.py.

Enables sorting strings that contain numbers naturally

usage:

natural.nsorted(list)

Copyright (C) 2013 Timothy Edmund Crosley

Implementation originally from @HappyLeapSecond stack overflow user in response to:

http://stackoverflow.com/questions/5967500/how-to-correctly-sort-a-string-with-a-number-inside

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated

documentation files (the "Software"), to deal in the Software without restriction, including without limitation

the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and

to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or

substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED

TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF

CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

OTHER DEALINGS IN THE SOFTWARE.

"""

import re

def _atoi(text):

return int(text) if text.isdigit() else text

def _natural_keys(text):

return [_atoi(c) for c in re.split(r'(\d+)', text)]

def nsorted(to_sort, key=None):

"""Returns a naturally sorted list"""

if key is None:

key_callback = _natural_keys

else:

def key_callback(item):

return _natural_keys(key(item))

return sorted(to_sort, key=key_callback)