[issue22089] collections.MutableSet does not provide update method

[Raymond Hettinger]

Raymond Hettinger added the comment:

The starting point for this feature request should be recognizing that Guido intentionally chose to not implement the named methods.

Excerpt from PEP 3119:

"This also supports the in-place mutating operations |=, &=, ^=, -=. These are concrete methods whose right operand can be an arbitrary Iterable, except for &=, whose right operand must be a Container. This ABC does not provide the named methods present on the built-in concrete set type that perform (almost) the same operations."

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22089>
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