23 lines
818 B
Text
23 lines
818 B
Text
When you try to sort a list of strings that contain numbers, the
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normal python sort algorithm sorts lexicographically, so you might
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not get the results that you expect:
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>>> a = ['a2', 'a9', 'a1', 'a4', 'a10']
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>>> sorted(a)
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['a1', 'a10', 'a2', 'a4', 'a9']
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Notice that it has the order ('1', '10', '2') - this is because the
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list is being sorted in lexicographical order, which sorts numbers
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like you would letters (i.e. 'b', 'ba', 'c').
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natsort provides a function natsorted that helps sort lists
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"naturally", either as real numbers (i.e. signed/unsigned floats
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or ints), or as versions. Using natsorted is simple:
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>>> from natsort import natsorted
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>>> a = ['a2', 'a9', 'a1', 'a4', 'a10']
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>>> natsorted(a)
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['a1', 'a2', 'a4', 'a9', 'a10']
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natsorted identifies numbers anywhere in a string and sorts them
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naturally.
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