Why the super class is empty when define child class?

Question

When creating child class, specify the super class as empty.

class Foo1():pass
class Foo2:pass

What is the different of Foo1 and Foo2.

And there are some other class definition.

class Foo3(object):

score 0 · Answer 1 · edited May 23 '17 at 12:00

In Python 2, not specifying a parent class creates an old-style class. Explicitly inheriting from object creates a new-style class.

(There is no difference between class Foo and class Foo() that I know of. Both just result in an old-style class with no parent.)

In Python 3, all three syntaxes result in a new-style class; there's no difference.

See the following posts:

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