Python 'object' type and inheritance

Inheriting from object makes a class a "new-style class". There is a discussion of old-style vs. new-style here: What is the difference between old style and new style classes in Python?

As @CrazyJugglerDrummer commented below, in Python 3 all classes are "new-style" classes. In Python 3, the following two declarations are exactly equivalent:

class A(object):
    pass

class A:
    pass

The first creates an "old-style" class, which are deprecated and have been removed in Python 3. You should not use it in Python 2.x. See the documentation for the Python data model.

Old style and new style objects... they have sightly different behaviours, for example in the constructors, or in the method resolution order in multiple inheritance.