Old-style and new-style classes in Python 2.7 [duplicate]

Question

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Old style and new style classes in Python

What is the current state of affairs with new-style and old-style classes in Python 2.7?

I don't work with Python often, but I vaguely remember the issue. The documentation doesn't seem to mention the issue at all: The Python Tutorial: Classes. Do I still need to worry about this? In general, should I declare my classes like the following?

class MyClass:     pass 

or?

class MyClass(object):     pass 

Answer 1

Always subclass "object". Those are new style classes.

• You are ready for Python 3 that way.

• Things like .super() work properly that way, should you need them.

Answer 2

You should always use new style classes. New-style classes are part of an effort to unify built-in types and user-defined classes in the Python programming language.

New style classes have several things to offer such as:

• Properties: Attributes that are defined by get/set methods
• Static methods and class methods
• The new getattribute hook, which, unlike getattr, is called for every attribute access, not just when the attribute can’t be found in the instance
• Descriptors: A protocol to define the behavior of attribute access through objects
• Overriding the constructor new
• Metaclasses

Source.