[pypy-issue] [issue1235] "__len__ should return bool or integer" inconsistant with CPython

[Aaron Meurer]

New submission from Aaron Meurer <asmeurer at gmail.com>:

CPython:

>>> class One(object):
...     def __int__(self):
...         return 1
... 
>>> class Test(object):
...     def __len__(self):
...         return One()
... 
>>> bool(Test())
True

PyPy (1.9):

>>>> class One(object):
....     def __int__(self):
....         return 1
.... 
>>>> class Test(object):
....     def __len__(self):
....         return One()
.... 
>>>> bool(Test())
Traceback (most recent call last):
  File "<console>", line 1, in <module>
TypeError: __len__ should return bool or integer

I'm not sure if __int__ is the necessary thing that the object needs to have 
defined, but clearly PyPy should allow __len__ to return custom objects assuming 
that they have certain methods defined.

----------
messages: 4652
nosy: asmeurer, pypy-issue
priority: bug
status: unread
title: "__len__ should return bool or integer" inconsistant with CPython

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PyPy bug tracker <tracker at bugs.pypy.org>
<https://bugs.pypy.org/issue1235>
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