[pypy-issue] Issue #2325: `__slots__` and `__class__` assignment is broken (pypy/pypy)

Daniel Holth issues-reply at bitbucket.org
Mon Jun 13 11:32:05 EDT 2016

New issue 2325: `__slots__` and `__class__` assignment is broken

Daniel Holth:

SCons does a lot of `__class__` assignment with classes using `__slots__`. This doesn't work on PyPy. PyPy is documented to be limited here, but SCons is also careful to keep `__slots__` the same between morphing classes, while the error message suggests the class layout differs.

Small test case


class A(object):
    __slots__ = ['a']

class B(object):
    __slots__ = ['a']

a = A(); a.__class__ = B

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