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Issue #21421: Add __slots__ to the MappingViews ABCs.

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This commit is contained in:
Raymond Hettinger 2014-05-03 19:06:32 -07:00
parent 90e9338383
commit 3170d1cccb
2 changed files with 11 additions and 0 deletions
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8
Lib/_collections_abc.py
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@ -440,6 +440,8 @@ def __ne__(self, other):
class MappingView(Sized): class MappingView(Sized):
__slots__ = '_mapping',
def __init__(self, mapping): def __init__(self, mapping):
self._mapping = mapping self._mapping = mapping
@ -452,6 +454,8 @@ def __repr__(self):
class KeysView(MappingView, Set): class KeysView(MappingView, Set):
__slots__ = ()
@classmethod @classmethod
def _from_iterable(self, it): def _from_iterable(self, it):
return set(it) return set(it)
@ -467,6 +471,8 @@ def __iter__(self):
class ItemsView(MappingView, Set): class ItemsView(MappingView, Set):
__slots__ = ()
@classmethod @classmethod
def _from_iterable(self, it): def _from_iterable(self, it):
return set(it) return set(it)
@ -489,6 +495,8 @@ def __iter__(self):
class ValuesView(MappingView): class ValuesView(MappingView):
__slots__ = ()
def __contains__(self, value): def __contains__(self, value):
for key in self._mapping: for key in self._mapping:
if value == self._mapping[key]: if value == self._mapping[key]:

3
Misc/NEWS
View file

@ -73,6 +73,9 @@ Library
Decimal.quantize() method in the Python version. It had never been Decimal.quantize() method in the Python version. It had never been
present in the C version. present in the C version.
- Issue #21421: Add __slots__ to the MappingViews ABC.
Patch by Josh Rosenberg.
- Issue #21101: Eliminate double hashing in the C speed-up code for - Issue #21101: Eliminate double hashing in the C speed-up code for
collections.Counter(). collections.Counter().