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authorRaymond Hettinger <python@rcn.com>2005-08-13 02:29:58 (GMT)
committerRaymond Hettinger <python@rcn.com>2005-08-13 02:29:58 (GMT)
commit038ca2a5516f6b445a8548f3999d1db3b6b8abb1 (patch)
tree3359f325b2eb27e8ed326bdac148d0de7ff62387 /Lib/sets.py
parentf98e6b15bab7efb786ab65db63146afea388b022 (diff)
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Teach the sets module to correctly compute s-=s and s^=s as the empty set.
Diffstat (limited to 'Lib/sets.py')
-rw-r--r--Lib/sets.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/Lib/sets.py b/Lib/sets.py
index 8ec7e2f..32a0dd6 100644
--- a/Lib/sets.py
+++ b/Lib/sets.py
@@ -480,6 +480,8 @@ class Set(BaseSet):
value = True
if not isinstance(other, BaseSet):
other = Set(other)
+ if self is other:
+ self.clear()
for elt in other:
if elt in data:
del data[elt]
@@ -497,6 +499,8 @@ class Set(BaseSet):
data = self._data
if not isinstance(other, BaseSet):
other = Set(other)
+ if self is other:
+ self.clear()
for elt in ifilter(data.has_key, other):
del data[elt]