__future__ and __rdiv__

Massimo Di Pierro massimo.dipierro at gmail.com
Mon Jan 23 00:22:49 EST 2012

Hello everybody,

I hope somebody could help me with this problem. If this is not the right place to ask, please direct me to the right place and apologies.
I am using Python 2.7 and I am writing some code I want to work on 3.x as well. The problem can be reproduced with this code:

# from __future__ import division
class Number(object):
    def __init__(self,number):
    def __rdiv__(self,other):
        return other/self.number
print 10/Number(5)

It prints 2 as I expect. But if I uncomment the first line, I get:

Traceback (most recent call last):
  File "test.py", line 8, in <module>
    print 10/Number(5)
TypeError: unsupported operand type(s) for /: 'int' and 'Number'

Is this a bug or the __future__ division in 3.x changed the way operators are overloaded? Where can I read more?


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