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Record a clue about why __or__ is not union, etc.

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Tim Peters 2002-08-25 17:10:17 +00:00
parent c8f8034512
commit 4924db176b
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5
Lib/sets.py
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@ -141,6 +141,11 @@ def __deepcopy__(self, memo):
# Standard set operations: union, intersection, both differences. # Standard set operations: union, intersection, both differences.
# Each has an operator version (e.g. __or__, invoked with |) and a # Each has an operator version (e.g. __or__, invoked with |) and a
# method version (e.g. union). # method version (e.g. union).
# Subtle: Each pair requires distinct code so that the outcome is
# correct when the type of other isn't suitable. For example, if
# we did "union = __or__" instead, then Set().union(3) would return
# NotImplemented instead of raising TypeError (albeit that *why* it
# raises TypeError as-is is also a bit subtle).
def __or__(self, other): def __or__(self, other):
"""Return the union of two sets as a new set. """Return the union of two sets as a new set.