Old-style and new-style classes in Python 2.7

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.

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.