[issue4482] 10e667.__format__('+') should return 'inf'

[Mark Dickinson]

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

Here are my proposed tests for this---they're for percent formatting 
rather than format() formatting.  They conflict slightly with Daniel's 
tests, in that I think

format(float('inf'), '+')

should produce '+inf' rather than plain 'inf'.

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Added file: http://bugs.python.org/file13708/issue4482_tests.patch

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