[issue1640] Enhancements for mathmodule

[Guido van Rossum]

Guido van Rossum added the comment:

> Why not implement copysign?  It's a standard, familiar function with well-
> documented meaning all over the web, and it can easily be used to create
> whatever sign test is necessary, letting the user decide what results
> (s)he wants for +/-0, +/-nan, etc.

Good idea. Since you seem to like providing patches, can you create
one for math.copysign()?

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