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PERF: improve speed of nans in CategoricalIndex #21493

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Jun 15, 2018
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PERF: improve speed of nans in CategoricalIndex #21493

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2 changes: 1 addition & 1 deletion pandas/core/indexes/category.py
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Original file line number Diff line number Diff line change
Expand Up @@ -326,7 +326,7 @@ def __contains__(self, key):
hash(key)

if isna(key): # if key is a NaN, check if any NaN is in self.
return self.isna().any()
return self.hasnans

# is key in self.categories? Then get its location.
# If not (i.e. KeyError), it logically can't be in self either
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