[Python] How do I import package when running

I have a directory structure that can be simplified like this:

test/
scripts/
a.py
src/
b.py


In a.py, I have the line:

import src.b

If I'm in the test directory, I want this to work:

python3 scripts/a.py

If I'm in the scripts directory, I want this to work:

python3 a.py

How can I accomplish this?

If I move a.py to the top level, it works. I don't want to call the script using python -m scripts.a.

Do I need to import sys and add '..'? Do I need an init.py in the src directory? Do I need relative imports using import ..src? Does the current directory vs the script directory matter?

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