Overload int() in Python

Question

Say I have a basic class in Python 3 which represents some number-like data-type. I want to make it so when I have an instance, x, of this class I can call int(x) and have it call my conversion function to return the integer portion.

I'm sure this is simple, but I can't seem to find out how to do it.

Jon Clements · Accepted Answer · 2014-05-04 14:58:31Z

27

You override the __int__ magic method as per the following example...

class Test:
    def __init__(self, i):
        self.i = i
    def __int__(self):
        return self.i * 2

t = Test(5)
print( int(t) )
# 10

edited May 4, 2014 at 14:58

answered Jul 20, 2012 at 8:17

Jon Clements

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Ignacio Vazquez-Abrams · Accepted Answer · 2012-07-20 08:11:36Z

8

Override the __int__() method.

answered Jul 20, 2012 at 8:11

Ignacio Vazquez-Abrams

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2 Comments

Ignacio Vazquez-Abrams Over a year ago

@Joel: Not in the least.

Joel Cornett Over a year ago

You learn something new everyday! Although I'm surprised I overlooked this while reading the docs :P

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