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Before py2.6 it’s been answered here. Difference between class foo and class foo(object) in Python
But for python2.6+ and python3.x, is the first one wrong?
class Foo(): pass vs class Foo(object): pass
For Python2.6+, before Python 3.0, the former creates an old-style class while the latter creates a new-style class. In Python 3.0, both create a new-style. The first isn’t wrong, but for anything before 3.0 it has different semantics than the latter and is typically discouraged.