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48 lines
1.8 KiB
Python
48 lines
1.8 KiB
Python
"""isort/natural.py.
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Enables sorting strings that contain numbers naturally
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usage:
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natural.nsorted(list)
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Copyright (C) 2013 Timothy Edmund Crosley
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Implementation originally from @HappyLeapSecond stack overflow user in response to:
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https://stackoverflow.com/questions/5967500/how-to-correctly-sort-a-string-with-a-number-inside
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
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documentation files (the "Software"), to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and
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to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies or
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substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
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TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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"""
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import re
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def _atoi(text):
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return int(text) if text.isdigit() else text
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def _natural_keys(text):
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return [_atoi(c) for c in re.split(r'(\d+)', text)]
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def nsorted(to_sort, key=None):
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"""Returns a naturally sorted list"""
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if key is None:
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key_callback = _natural_keys
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else:
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def key_callback(item):
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return _natural_keys(key(item))
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return sorted(to_sort, key=key_callback)
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