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| author | Raymond Hettinger <python@rcn.com> | 2005-08-13 02:28:54 (GMT) |
|---|---|---|
| committer | Raymond Hettinger <python@rcn.com> | 2005-08-13 02:28:54 (GMT) |
| commit | ab294199b772e47dd86ca665dbc1080715b844d2 (patch) | |
| tree | 355e719f2cbc756be0d9c8a2943a9056cc304a77 /Lib/sets.py | |
| parent | 787b4c5fea8476a1146918f90a6da7f63d7aa31c (diff) | |
| download | cpython-ab294199b772e47dd86ca665dbc1080715b844d2.zip cpython-ab294199b772e47dd86ca665dbc1080715b844d2.tar.gz cpython-ab294199b772e47dd86ca665dbc1080715b844d2.tar.bz2 | |
Teach set modules to correctly compute s-=s and s^=s as the empty set.
Diffstat (limited to 'Lib/sets.py')
| -rw-r--r-- | Lib/sets.py | 4 |
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] |