如何檢查在 Python 中已給定的類中定義或派生的類屬性?

以下程式碼顯示是否在類 A 和 B 中定義或派生屬性“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

輸出

{'__module__': '__main__', 'foo': 1, '__doc__': None}
True
{'__module__': '__main__', '__doc__': None}
True

Rajendra Dharmkar

更新於: 16-6-2020

267 次瀏覽

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