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Added a clue about why xyz_update isn't the same as __xyz__.

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Tim Peters 2002-08-25 18:59:04 +00:00
parent ea76c98014
commit 4a2f91e302
1 changed files with 4 additions and 1 deletions
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5
Lib/sets.py
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@ -361,7 +361,10 @@ class Set(BaseSet):
# We inherit object.__hash__, so we must deny this explicitly # We inherit object.__hash__, so we must deny this explicitly
raise TypeError, "Can't hash a Set, only an ImmutableSet." raise TypeError, "Can't hash a Set, only an ImmutableSet."
# In-place union, intersection, differences # In-place union, intersection, differences.
# Subtle: The xyz_update() functions deliberately return None,
# as do all mutating operations on built-in container types.
# The __xyz__ spellings have to return self, though.
def __ior__(self, other): def __ior__(self, other):
"""Update a set with the union of itself and another.""" """Update a set with the union of itself and another."""