Python:访问另一个类的属性和方法 [英] Python: accessing attributes and methods of one class in another

问题描述

假设我有两个班级A和B:

Let's say I have two classes A and B:

Class A:
   # A's attributes and methods here

Class B:
  # B's attributes and methods here

现在我可以按以下方式评估B类对象中A的属性:

Now I can assess A's properties in object of B class as follows:

a_obj = A()
b_obj = B(a_obj)

我需要的是双向访问. 如何访问B中的A属性和A中的B属性?

What I need is a two way access. How do I access A's properties in B and B's properties in A ?

推荐答案

您需要使用以下两种方式创建指针:

You need to create pointers either way:

class A(object):
    parent = None


class B(object):
    def __init__(self, child):
        self.child = child
        child.parent = self

现在A可以引用self.parent(前提是它不是None)，而B可以引用self.child.如果您尝试将A的实例作为多个B的子代，则最后一个父代"获胜.

Now A can refer to self.parent (provided it is not None), and B can refer to self.child. If you try to make an instance of A the child of more than one B, the last 'parent' wins.

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