Python - "object Layout"

can somebody describe the following exception? What is the 'object layout' and how it is defined? Thanks Traceback (most recent call last): File 'test_gui.py', line 5, in

Solution 1:

It means that you tried to change the type of an object (by assigning to __bases__) and the new type wasn't compatible with the old one. This happens when the underlying C data structure isn't the same for both types.

See http://www.mail-archive.com/python-list@python.org/msg52950.html for a list of differences between types that might trigger this exception.

Solution 2:

In my case, the error occurred when I tried to use change the __class__ of an object that also has __slots__, like this:

class Base:
    __slots__ = ('a', 'b', 'c')

class Child(Base):
    pass


obj = Base()
obj.__class__ = Child  
# -> TypeError: __class__ assignment: 'Child' object layout differs from 'Base'

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