New submission from João Bernardo <jbv...@gmail.com>:

I'm having trouble subclassing the int type and I think this behavior is a 
bug... (Python 3.2)

>>> class One(int):
        def __init__(self):
                super().__init__(1)

>>> one = One()
>>> one + 2
2
>>> one == 0
True

I know `int` objects are immutable but my `One` class should be mutable... and 
why it doesn't raise an error?

That gives the same result on Python 2.7 using super properly.

Also, if that's not a bug, how it should be done to achieve "one + 2 == 3" 
without creating another attribute.

Things I also tried:
    self.real = 1  #readonly attribute error
    int.__init__(self, 1)  #same behavior

I Couldn't find any related issues... sorry if it's repeated.

----------
components: Interpreter Core
messages: 140161
nosy: JBernardo
priority: normal
severity: normal
status: open
title: Extending int class
type: behavior
versions: Python 2.7, Python 3.2

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12538>
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