[issue8750] Many of MutableSet's methods assume that the other parameter is not self

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

Here's a possible fix:

def __isub__(self, it):
    if it is self:
        self.clear()
    else:
        for value in it:
            self.discard(value)
    return self

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nosy: +rhettinger
versions: +Python 2.6, Python 3.1

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<http://bugs.python.org/issue8750>
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