Is it possible to override __getitem__ at instance level in Python?

With the following code :

import typesclass Foo():    def __getitem__(self, x):        return xdef new_get(self, x):    return x + 1x = Foo()x.__getitem__ = types.MethodType(new_get, x)

x.__getitem__(42) will return 43, but x[42] will return 42.

Is there a way to override __getitem__ at instance level in Python?