如何修复 Python 中的导入同级包/模块？

Question

I have this file structure

.
└── sample
    ├── one
    │   ├── __init__.py
    │   └── util.py
    └── two
        ├── __init__.py
        └── test.py

Here is the content of util.py

def isOk():
    return True

Here is the content of test.py

from sample.one import util

Whenever I'm inside the [two] folder and I type

python test.py

I get

Traceback (most recent call last):
  File "test.py", line 1, in <module>
    from sample.one import util
ModuleNotFoundError: No module named 'sample'

How is that possible when I create all folders and __init__.py by the book?

It seems that a method to invoke it might be

python -m two.test

Answer 1

If one and two are both subpackages of sample , then you should add a sample/__init__.py which may be empty.

If you then invoke python -m sample.two.test from the right directory, it should work.

You could even add package-relative imports like this:

# test.py
from ..one import util

Answer 2

Please add the dir path to your PYTHONPATH

export PYTHONPATH=/PATH/TO/DIR/WHICH/CONTAINS/SAMPLE

2 real nice links to go through are:

1. https://docs.python.org/3/tutorial/modules.html
2. https://docs.python.org/3/reference/import.html