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Showing content from http://mail.python.org/pipermail/python-list/2005-September/301171.html below:

Dynamically adding and removing methods

Dynamically adding and removing methods Dynamically adding and removing methodsCollin Winter collinw at gmail.com
Sat Sep 24 14:33:11 EDT 2005
One caveat, as I recently discovered, to dynamically adding methods is
that it doesn't work for __foo__ methods. For example, you can't make
an object into an iterator by dynamically assigning bound methods to
obj.__iter__ and obj.next. Same thing with __getitem__, __setitem__,
etc; adding them directly to the instance doesn't get you a
subscriptable object. This is because the interpreter looks at the
methods defined by the class, rather than the instance's attributes.

Just a word of caution.

Collin Winter

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