Delegation in Python
tjreedy at udel.edu
Sun Jan 25 02:31:31 CET 2015
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)
>>> F(12, 3)
the test is that the denominator is 1
>>> F(12,3).denominator == 1
>>> F(12,5).denominator == 1
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.
Python is not Java.
Terry Jan Reedy
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