Where is

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What is the difference between old style and new style classes in Python? 9 answers

Python class inherits object 7 answers

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In Python 3, if you create a class without adding a parent class it automatically inherits from object. You can't create old style classes anymore like Python 2.

Example:

class A: # gets defaulted to class A(object):
    pass

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All classes in Python3 are subclasses of object as you can see from the mro:

>>> class A: pass
... 
>>> A.__mro__
(<class '__main__.A'>, <class 'object'>)

class A(object) is still done in some Python 3 code to maintain backward compatibility with Python 2.

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