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Sped intersection by large factors (3-5x faster than before on sets of

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cardinality 500; and the smaller the intersection, the bigger the speedup).
This commit is contained in:
Tim Peters 2002-08-25 19:12:45 +00:00
parent 4a2f91e302
commit d33e6be59d
1 changed files with 2 additions and 7 deletions
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9
Lib/sets.py
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@ -176,13 +176,8 @@ class BaseSet(object):
little, big = self, other little, big = self, other
else: else:
little, big = other, self little, big = other, self
result = self.__class__() common = filter(big._data.has_key, little._data.iterkeys())
data = result._data return self.__class__(common)
value = True
for elt in little:
if elt in big:
data[elt] = value
return result
def intersection(self, other): def intersection(self, other):
"""Return the intersection of two sets as a new set. """Return the intersection of two sets as a new set.