您可以使用 type（name，bases，dict） 内建功能即时创建类。例如：

You can use the type(name, bases, dict) builtin function to create classes on the fly. For example:

op = type("MyOptionParser", (OptionParser,object), {"foo": lambda self: "foo" })
op().foo()

由于OptionParser不是new-style类，你必须在基类列表中显式包含 object 。

Since OptionParser isn't a new-style class, you have to explicitly include object in the list of base classes.