Martin Panter added the comment:
For what it’s worth, every now and then I have to stop and remember that I
can’t do this sort of thing:
unsupported_keys = config_dict.keys().difference(supported_list)
though it is not a big problem to rewrite it as
unsupported_keys = config_dict.keys() - set(supported_list)
Also it looks like one can already effectively do x.copy() using the existing
immutable Set operators, so that worm can is already opened:
>>> ListBasedSet("abc") & ListBasedSet("abc")
<__main__.ListBasedSet object at 0x7f419951b860>
On the other hand, a matching almost equivalent operator does exist for
a.issubset(b): a <= b, or a.__le__(b).
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<http://bugs.python.org/issue23161>
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