Raymond Hettinger added the comment:
It's not a bug. Guido designed the Set ABC to use operators instead of the
named methods. The += operator for the __ior__() method that provides much of
the same functionality.
In your concrete class, you can add an update() method easily:
class MySet(Set):
update = Set.__ior__()
Mutable mapping has an update() method because it is an essential part of the
mapping API and because there is no operator equivalent as there is for the set
API.
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<http://bugs.python.org/issue22089>
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