Python operator overloading div [duplicate]

Question

I have a class that has the functions mul and div implemented as follows:

def __mul__(self, other): return Foo(self.a * other) def __div__(self, other): return Foo(self.a / other)

The multiplication (e.g. a * b, where a is an instance of the class Foo and b is an integer) works fine, but the division (a / b) gives an error saying the operator is not supported. How do I get around this?

TypeError: unsupported operand type(s) for /: 'Foo' and 'int'

Have you tried overloading __truediv__ (/) and __floordiv__ (//) instead? — Felk
– Felk, Commented Nov 29, 2015 at 19:51

Daniel · Accepted Answer · 2015-11-29 19:55:37Z

8

You are using from __future__ import division. So you have to implement __truediv__ for /, and __floordiv__ for //.

answered Nov 29, 2015 at 19:55

Daniel

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Szymon Zmilczak · Accepted Answer · 2015-11-29 19:52:13Z

Use __rdiv__: division with reversed operands. https://docs.python.org/2/reference/datamodel.html#object.rdiv

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