[Python] Is there a built in function for string natural sort?

I have a list of strings for which I would like to perform a natural alphabetical sort.

For instance, the following list is naturally sorted (what I want):

['elm0', 'elm1', 'Elm2', 'elm9', 'elm10', 'Elm11', 'Elm12', 'elm13']


And here's the "sorted" version of the above list (what I get using sorted()):

['Elm11', 'Elm12', 'Elm2', 'elm0', 'elm1', 'elm10', 'elm13', 'elm9']


I'm looking for a sort function which behaves like the first one.

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