Python新式类和经典类的区别

class ClassicClass():
    pass

class NewStyleClass(object):
    pass

x1 = ClassicClass()
x2 = NewStyleClass()

print x1.__class__, type(x1)
print x2.__class__, type(x2)

输出结果：

__main__.ClassicClass <type 'instance'>
<class '__main__.NewStyleClass'> <class '__main__.NewStyleClass'>

经典类的继承是深度优先，新式类的继承是广度优先。