为什么我需要包含 sys.path.append 来使用 Python 3.6 导入模块而我的大学不需要？

Question

I have been facing a weird situation for some months now.

In the several codes I have been working, to import a module in python 3.6.9, Ubuntu 18.04, such as:

import src.Modules.ABC.DC as DC

I do need to include sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', '..')) but all my colleges at work using the same code and virtual environment just does not need that line.

If it helps, in the terminal, if I do not include that line it returns:

ModuleNotFoundError: No module named 'src'

Consequently, my questions are:

1-Why do I need to include that line and in a different computer I does not need?

2-Do you suggested to always include that line to have a more reliable code?

The folder structure is something like:

Myproject/src/Modules/ABC/DE

Myproject/tests/Modules/ABC/test_DE

I created a virtual env at Myproject, at src, tests and so on. And it returns always the same. When I run without a venv it also returns the same problem. The python command I use is

python3 tests/Modules/ABC/test_DE.py

This is just annoying since I always need to remove that line to request a merge.

Answer 1

Just set the PYTHONPATH environment variable to (the full path to) Myproject . That tells Python where to find modules to import, and it works regardless of which directory you run the script from. This avoids the need to modify sys.path .