Python package import from parent directory

It all depends on which script you run. That script’s path will be added to python’s search path automatically.

Make it the following structure:

TestApp/
├─ testapp/
│  ├─ __init__.py
│  ├─ testmsg.py
│  ├─ sub/
│  │  ├─ __init__.py
│  │  ├─ testprinter.py
├─ README
├─ LICENSE
├─ setup.py
├─ run_test.py

Then run TestApp/run_test.py first:

from testapp.sub.testprinter import functest ; functest()

Then TestApp/testapp/sub/testprinter.py could do:

from testapp.testmsg import MSG
print("The message is: {0}".format(testmsg.MSG))

More good hints here;