[issue23229] add inf, nan, infj, nanj to cmath module

[Mark Dickinson]

Mark Dickinson added the comment:

@haypo: I'm not keen on either of infj or nanj, on a YAGNI basis.  I expect they'd be used almost never, and for the few times that they're really needed, complex(0, inf) and complex(0, nan) seem like good enough spellings.

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<http://bugs.python.org/issue23229>
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