[issue8685] set(range(100000)).difference(set()) is slow

[Andrew Bennetts]

Andrew Bennetts <spiv at users.sourceforge.net> added the comment:

Oops, obvious bug in this patch. set('abc') - set('bcd') != set('bcd') - set('abc').  I'll see if I can make a more sensible improvement.

See also <http://bugs.python.org/issue8425>.  Thanks dickinsm on #python-dev.

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