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PERF: Override PeriodIndex.unique #23083

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Merged
merged 3 commits into from
Oct 11, 2018
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PERF: Override PeriodIndex.unique #23083

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PERF: Override PeriodIndex.unique
jbrockmendel Oct 11, 2018
bf96253
add asv
jbrockmendel Oct 11, 2018
3bd918c
whatsnew performance note
jbrockmendel Oct 11, 2018
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3 changes: 3 additions & 0 deletions asv_bench/benchmarks/period.py
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Original file line number Diff line number Diff line change
Expand Up @@ -119,3 +119,6 @@ def time_align(self):

def time_intersection(self):
self.index[:750].intersection(self.index[250:])

def time_unique(self):
self.index.unique()
13 changes: 13 additions & 0 deletions pandas/core/indexes/period.py
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Expand Up @@ -29,6 +29,7 @@
DIFFERENT_FREQ_INDEX)
from pandas._libs.tslibs import resolution, period

from pandas.core.algorithms import unique1d
from pandas.core.arrays import datetimelike as dtl
from pandas.core.arrays.period import PeriodArrayMixin, dt64arr_to_periodarr
from pandas.core.base import _shared_docs
Expand Down Expand Up @@ -539,6 +540,18 @@ def _get_unique_index(self, dropna=False):
res = res.dropna()
return res

@Appender(Index.unique.__doc__)
def unique(self, level=None):
# override the Index.unique method for performance
if level is not None:
# this should never occur, but is retained to make the signature
# match Index.unique
self._validate_index_level(level)

values = self._ndarray_values
result = unique1d(values)
return self._shallow_copy(result)

def get_loc(self, key, method=None, tolerance=None):
"""
Get integer location for requested label
Expand Down