Terry J. Reedy <tjre...@udel.edu> added the comment:

I think *both* proposals are sensible. Fraction already has .from_decimal 
(using Decimal), so .to_decimal (also using Decimal) is sensible. It also has 
.from_float, with 'f.to_float' spelled f.__float__, normally called as float(f).

On the other hand, part of the point of the new format system was/is to allow 
'other' classes to tie into format specs with custom .__format__. Currently, 
Fraction inherits .__format__ from object, which only recognizes 's' 
specifications. (Anything else gives a misleading 'str' error message that is 
the subject of another issue.) I think it should get a custom .__format__, 
which could use f.to_decimal(prec), where prec is calculated from the format 
spec.

----------
nosy: +eric.smith, terry.reedy

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<http://bugs.python.org/issue15136>
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