即使使用__init__.py文件，Python导入错误

Question

I have 3 directories under S1

S1
   - D1
       --python1.py
   - D2
       --python2.py
   - D3
       --python3.py

In python3.py module, I have a statement(below) to import python2.py

import D2.python2

when I run python3.py I get a error " No module named D2.python2"

How can I fix this issue?

Note: I have __init__.py in all the directories to signify packages.

Answer 1

You need to make sure your S1 directory is on your python module search path so that the interpreter knows how to load it.

The easiest way is to add it to your PYTHONPATH environment variable.