On 25/01/2015 01:31, Terry Reedy wrote: > On 1/24/2015 5:57 PM, Brian Gladman wrote: >> I would appreciate advice on how to set up delgation in Python. >> >> I am continuously implementing a function to test whether a Python >> Fraction is an integer > > Since Fractions are reduced to lowest terms, >>>> from fractions import Fraction as F >>>> F(4, 2) > Fraction(2, 1) >>>> F(12, 3) > Fraction(4, 1) > > the test is that the denominator is 1
Thanks Terry, I should have realised this but didn't. >>>> F(12,3).denominator == 1 > True >>>> F(12,5).denominator == 1 > False > > it may not be worth the bother to define a function, > > def fint(F): return F.denominator == 1 > >> so I wanted to define a new class, based on >> Fraction, that includes this new method. > > but if you do, there is little need to make it a method. You are not > overriding an existing method or adding a new special method. The math > module has float and int functions that have *not* been turned into > methods. Ditto for cmath. I would just leave the function a function. Yes, it seems so. Brian -- https://mail.python.org/mailman/listinfo/python-list
