python - python nested classes with adjacent inheritence?

Question

class A(object):
    class B(object): pass
    class C(A.B): pass

results in

NameError: name 'A' is not defined

How do I inherit from B in C, if they are adjacent , both nested in A (inner classes)?

Answer 1

A在类主体完成执行之前，您不能使用。

您可以参考“本地”名称；类体作为函数执行，该函数的本地命名空间用于提供类属性；在类体内，B是一个本地名称：

class A(object):
    class B(object): pass
    class C(B): pass