[issue7094] Add alternate float formatting styles to new-style formatting.

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Gah.  That doesn't work for zeros, though.

Apart from this, the rest of the patch looks good, and all tests pass on my machine.  (Well, except for test_urllib2_localnet, but I'm pretty sure that failure is unrelated.)

I hadn't realized the use_alt_formatting stuff was already present in Python/pystrtod.c.

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