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Showing content from https://mail.python.org/pipermail/python-dev/2008-February/077174.html below:

[Python-Dev] can't set attributes of built-in/extension type

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Neal Becker wrote:
> (Or, help me understand, what is the difference between a type that I create
> using python C api and a python class?)

Classes that you create in Python have a __dict__ attribute
holding a dictionary for arbitrary attributes to go in.

Most types defined in C don't bother providing a __dict__,
since one doesn't normally need to add arbitrary
attributes to them, and the overhead would be almost
completely wasted.

-- 
Greg

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