如何检查类属性是在Python中的给定类中定义还是派生的？
下面的代码显示了是否在类A和B中定义或派生了属性'foo'。
示例
class A:
foo = 1
class B(A):
pass
print A.__dict__
#We see that the attribute foo is there in __dict__ of class A. So foo is defined in class A.
print hasattr(A, 'foo')
#We see that class A has the attribute but it is defined.
print B.__dict__
#We see that the attribute foo is not there in __dict__ of class B. So foo is not defined in class B
print hasattr(B, 'foo')
#We see that class B has the attribute but it is derived输出结果
{'__module__': '__main__', 'foo': 1, '__doc__': None}
True
{'__module__': '__main__', '__doc__': None}
True