Question

I wonder if there is something similar to,
say:

>>> class A(object):
...     def swap(self):
...         self = 'I am swapped'
... 
>>> abc=A()
>>> abc
<__main__.A object at 0x028B6130>
>>> abc.swap
<bound method A.swap of <__main__.A object at 0x028B6130>>
>>> abc.swap()
>>> abc
<__main__.A object at 0x028B6130>
>>> type(abc)
<class '__main__.A'>

see, it’s type is not str, but Class A.

Answer 1

this is a terrible idea … I do not advocate ever doing this … In fact you should avoid at all costs … look at using a Factory design pattern instead …

>>> class A:
...    def swap(self):
...      self.__class__ = B
...
>>> class B:
...   pass
...
>>> a = A()
>>> a.swap()
>>> a
<__main__.B instance at 0x02C43E18>
>>>