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