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Add comment to explain the implications of not sorting keywords #3331

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Merged
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Sep 5, 2017
Merged

Add comment to explain the implications of not sorting keywords #3331

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4 changes: 4 additions & 0 deletions Lib/functools.py
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Original file line number Diff line number Diff line change
Expand Up @@ -432,6 +432,10 @@ def _make_key(args, kwds, typed,
saves space and improves lookup speed.

"""
# All of code below relies on kwds preserving the order input by the user.
# Formerly, we sorted() the kwds before looping. The new way is *much*
# faster; however, it means that f(x=1, y=2) will now be treated as a
# distinct call from f(y=2, x=1) which will be cached separately.
key = args
if kwds:
key += kwd_mark
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