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 __iadd__() method that provides much of 
the same functionality.

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.

----------
assignee:  -> rhettinger
type:  -> enhancement
versions: +Python 3.5 -Python 3.3, Python 3.4

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue22089>
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