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

[Mark Dickinson]

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

Just for reference, the effect of the alternative style is explained 
succinctly in the C99 standard (well, the N1256 draft, anyway):

"For a, A, e, E, f, F, g, and G conversions, the result of converting a 
floating-point number always contains a decimal-point character, even if 
no digits follow it. (Normally, a decimal-point character appears in the 
result of these conversions only if a digit follows it.) For g and G 
conversions, trailing zeros are not removed from the result. For other 
conversions, the behavior is undefined."

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<http://bugs.python.org/issue7094>
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