Forest <fgr...@gmail.com> added the comment:
Sorry there was a typo in the first example block:
It should be
>>> {}.keys() & []
set()
>>> set() & []
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for &: 'set' and 'list'
>>> set() & [] does **not** return set() it raises a TypeError
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33874>
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