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

[Mark Dickinson]

Mark Dickinson added the comment:

Note: following the precedent of cmath.e and cmath.pi, cmath.nan and cmath.inf should have type *float*.  Let's not get into the business of deciding *which* complex infinities and nans to represent.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23229>
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