Comparing two class types in python

Question

I have two classes defined in a module classes.py:

class ClassA(object):
    pass

class ClassB(object):
    pass

And in another m

Answer 1

If you want to check if types are equal then you should use is operator.

Example: we can create next stupid metaclass

class StupidMetaClass(type):
    def __eq__(self, other):
        return False

and then class based on it:

• in Python 2

  class StupidClass(object):
      __metaclass__ = StupidMetaClass
  

• in Python 3

  class StupidClass(metaclass=StupidMetaClass):
      pass
  

then a simple check

StupidClass == StupidClass

returns False, while the next check returns an expected True value

StupidClass is StupidClass

So as we can see == operator can be overridden while there is no simple way to change is operator's behavior.