[issue8294] Allow Fraction constructor to accept float and decimal instances directly.

[Mark Dickinson]

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

Unfortunately, that line is wrong (or at least incomplete), since decimals in exponential form are also accepted:

>>> Fraction('2.3e4')
Fraction(23000, 1)

I could try to reinstate a fixed version.

Attaching a second version of the patch:  same as the first, except for some doc tweaks.  (Rewording, markup fixes.)

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Added file: http://bugs.python.org/file16740/fraction_from_float2.patch

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