Tarek Ziadé <ziade.ta...@gmail.com> added the comment:

Well, in that case I don't understand how it is different from
difference_update() ?

The doc says : 

set -= other | ...

suggesting that you can pipe several sets with -=,
exactly like what you can do with ^=.

The same applies with |=.

In other words, this whole section is unclear in 
what "other" is, and why we have "others" sometimes.
(eg a set or a several sets piped together for example)

----------
assignee: tarek -> 

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<http://bugs.python.org/issue6801>
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