Python：导入模块一次用于整个包 [英] Python : import module once for a whole package

问题描述

我正在编写一个基本结构化的应用程序：

I'm currently coding an app which is basically structured that way :

main.py

+ Package1

+ --- Class1.py

+ ---应用程序

+ Package2

+ --- Class1.py

+ ---应用程序

main.py
+ Package1
+--- Class1.py
+--- Apps
+ Package2
+--- Class1.py
+--- Apps

所以我有两个问题：
首先，在两个软件包中，所有应用程序都需要模块，例如：re。有没有办法可以一次为整个包导入一个模块，而不是在每个需要它的文件中导入它？

So I have two questions : First, inside both packages, there are modules needed by all Apps, eg : re. Is there a way I can import a module for the whole package at once, instead of importing it in every file that needs it ?

并且，正如你所看到的，Class1用于两个包中。有没有一种很好的方法在两个包之间共享它以避免代码重复？

And, as you can see, Class1 is used in both packages. Is there a good way to share it between both packages to avoid code duplication ?

推荐答案

我强烈建议不要这样做：将导入与使用该功能的模块分开，使得跟踪模块之间的依赖关系变得更加困难。

I would strongly recommend against doing this: by separating the imports from the module that uses the functionality, you make it more difficult to track dependencies between modules.

如果你真的想这样做，一个选项就是创建一个名为 common_imports 的新模块（例如）并让它执行您所追求的导入。

If you really want to do it though, one option would be to create a new module called common_imports (for example) and have it do the imports you are after.

然后在您的其他模块中，添加以下内容：

Then in your other modules, add the following:

from common_imports import *

这应该为您提供该模块的所有公共名称（包括所有导入）。

This should give you all the public names from that module (including all the imports).

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