Python无法导入名称< class> [英] Python cannot import name <class>

问题描述

我一直在努力解决导入错误，大部分时间都在摔跤。

I've been wrestling most of the night trying to solve an import error.

这是一个常见问题，但之前的问题没有解决我的问题。

This is a common issue, but no previous question quite answers my issue.

我正在使用PyDev（一个Eclipse插件）和库Kivy（一个Python库）

I am using PyDev (an Eclipse plugin), and the library Kivy (a Python library)

我有设置如下的文件结构：

I have a file structure set up like this:

<code>
    __init__.py
    main.py
    engine.py
    main_menu_widget.py

code保存在eclipse文件夹MyProject中，但它不是包，所以我没有包含它。

"code" is held within the eclipse folder "MyProject" but it's not a package so I didn't include it.

文件看起来像这样：

main.py

# main.py
from code.engine import Engine

class MotionApp(App):
    # Ommited

engine.py

engine.py

# engine.py
from code.main_menu_widget import MainMenuWidget

class Engine():
    # Ommited

main_menu_widget.py

main_menu_widget.py

# main_menu_widget.py
from code.engine import Engine

class MainMenuWidget(Screen):
    pass

我收到的错误，详细信息是：

The error I recieve, in full detail, is:

 Traceback (most recent call last):
   File "C:\MyProject\code\main.py", line 8, in <module>
     from code.engine import Engine
   File "C:\MyProject\code\engine.py", line 6, in <module>
     from code.main_menu_widget import MainMenuWidget
   File "C:\MyProject\code\main_menu_widget.py", line 3, in <module>
     from code.engine import Engine

知道我在这里做错了什么吗？我刚刚重命名了我的整个文件夹结构，因为我搞砸了这个模块结构这么糟糕，但我觉得我接近它的外观......

Any idea what I did wrong here? I just renamed my entire folder structure because I screwed up this module structure so bad, but I think i'm close to how it should look....

推荐答案

似乎有一个循环导入。来自 engine.py 的
您从 main_menu_widget main_menu_widget c $ c>您正在导入引擎。

There seems to be a circular import. from engine.py you are importing main_menu_widget while from main_menu_widgetyou are importing engine.

这显然是循环导入，python不允许。

That is clearly a circular import which is not allowed by python.

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