是否可以从 python 3.8 中的不同目录导入 package 中的所有模块？

Question

I am using Python 3.8. I have a directory structure like this:

├── package
│   ├── __init__.py
│   └── test2.py
└── test.py

Contents of test2:

def x():
   print(999)

Contents of __init__.py:

from test2 import *

Contens of test.py:

import package
package.x()

Running test.py gives the following error:

  from test2 import *
ModuleNotFoundError: No module named 'test2'

I want test.py to work as expected. Please help.

Answer 1

As the @hjpotter92 said, the problem is in the __init__.py file because the importation should be:

from .test2 import *

And then to use the functions inside test2.py in test.py you just need something like this:

import package
package.x()

Here you can find more information about this topic and some advices.

EDIT :

The main reason why you have to import using from.test2 import * and not from test2 import * is because test2 is inside what Python calls a package (you called the directory with the same name) and it's supposed to use outside the same package(in test.py ), otherwise you wouldn't need to use . to import it.

For instance, if you have a structure like this:

├── package
│   ├── __init__.py
│   └── test2.py
|   └── test3.py
└── test.py

In test3.py you can do: from test2 import x because is in the same package (named package)

. represents to the package where the module is in, for example, if you wanna import in test.py without using __init__.py you should do this: from package.test2 import *

Hope this can help you:)