Python中的循环依赖 [英] Circular dependency in Python

问题描述

我有两个文件 node.py 和 path.py ，它们定义了两个类， Node 和 Path 。

I have two files, node.py and path.py, which define two classes, Node and Path, respectively.

到今天为止，定义路径的对象引用了 Node 对象，因此我已经完成了

Up to today, the definition for Path referenced the Node object, and therefore I had done

from node.py import *

code> path.py 文件。

in the path.py file.

但是，到目前为止，我为 Node创建了一种新方法引用 Path 对象。

However, as of today I created a new method for Node that references the Path object.

尝试导入<$时遇到问题c $ c> path.py ：我尝试过，当程序运行并调用使用的 Path 方法时节点，关于未定义节点的异常上升。

I had problems when trying to import path.py: I tried it, and when the program ran and called the Path method that uses Node, an exception rose about Node not being defined.

我该怎么办？

推荐答案

导入Python模块 是一篇很棒的文章，解释了循环

Importing Python Modules is a great article that explains circular imports in Python.

最简单的解决方法是将路径导入移动到节点模块的末尾。

The easiest way to fix this is to move the path import to the end of the node module.

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