Python: Sort a list of strings composed of letters and numbers [duplicate]

问题

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Is there a built in function for string natural sort? (19 answers)

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I have a list that its elements are composed of a letters and numbers as shown below :

['H1', 'H100', 'H10', 'H3', 'H2', 'H6', 'H11', 'H50', 'H5', 'H99', 'H8'] 

I wanted to sort it, so I used the function sort, but I got as output :

>>> a = ['H1', 'H100', 'H10', 'H3', 'H2', 'H6', 'H11', 'H50', 'H5', 'H99', 'H8']
>>> print sorted(a)
['H1', 'H10', 'H100', 'H11', 'H2', 'H3', 'H5', 'H50', 'H6', 'H8', 'H99']

However, I want the output to be :

['H1', 'H2', 'H3', 'H5', 'H6', 'H8', 'H10', 'H11', 'H50', 'H99', 'H100']

Does anyone has an idea how to do this please? Thank you

回答1:

l = ['H1', 'H100', 'H10', 'H3', 'H2', 'H6', 'H11', 'H50', 'H5', 'H99', 'H8']
print sorted(l, key=lambda x: int("".join([i for i in x if i.isdigit()])))

Output:

['H1', 'H2', 'H3', 'H5', 'H6', 'H8', 'H10', 'H11', 'H50', 'H99', 'H100']

来源：https://stackoverflow.com/questions/49232823/python-sort-a-list-of-strings-composed-of-letters-and-numbers