[Python-Dev] Symmetry arguments for API expansion (original) (raw)

Guido van Rossum guido at python.org
Tue Mar 20 21:32:12 EDT 2018

No, the whole point of index is that it refuses all floats -- otherwise people will do approximate computations that for their simple test inputs give whole numbers, use them as sequence indices, and then find their code broken only when the computation incurs some floating point approximation. OTOH, is_integer() specifically asks whether a given real value is a whole number so you can cast it to int() without rounding, etc.

On Tue, Mar 20, 2018 at 5:32 PM, Chris Barker <chris.barker at noaa.gov> wrote:

It seems .asintegerratio() has been resolved.

what about the original .isinteger() request? (Or did I miss that somehow?) Anyway, it seems like index() should play a role here somehow... isn't that how you ask an object for the integer version of itself? Could float et al. add an index method that would return a ValueError if the value was not an integer? Of course, as pointed out earlier in this thread, an "exact" integer is probably not what you want with a float anyway.... -CHB

On Tue, Mar 13, 2018 at 10:29 PM, Tim Peters <tim.peters at gmail.com> wrote: [Tim] >> An obvious way to extend it is for Fraction() to look for a special >> method too, say "asintegerratio()".

[Greg Ewing] > Why not asintegerratio? Because. at this point, that would be beating a dead horse ;-)

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