Import libraries from ROOT directory in python

Question

I have the following structure of my program:

MainDir
├── __init__.py
├── main.py
├── Routine.py
└── Folder1
    ├── __init__.py
    └──function.py

I know that I can import a function from folder 1 to my main.py program writing this statement:

from Folder1.function import foo

But, I am looking for a way to do so in the other direction. How could I import a function defined in Routine.py to function.py?

Does this answer your question? https://stackoverflow.com/questions/15109548/set-pythonpath-before-import-statements — paltaa, May 26 '20 at 16:25
Also this: https://docs.python.org/2/whatsnew/2.5.html#pep-328-absolute-and-relative-imports — paltaa, May 26 '20 at 16:26
The first one worked for me. I imported `os library` to get my current working directory and then appended it to the `sys.path` — Erincon, May 26 '20 at 17:41
in `folder1/fucntion` you can write `from main.routine import function1` — sahasrara62, May 27 '20 at 01:22

score 0 · Answer 1 · answered May 26 '20 at 16:33

It depends on how you are invoking your program.

Invoking as a module

Do you do something like

python -m MainDir.main

and whatever code is in your MainDir.main calls out to MainDir/Folder1/function.py?

In this case, you can simply add the following import to MainDir/Folder1/function.py:

from ..Routine import RoutineFunction

Invoking as a script

If you are instead invoking MainDir/Folder1/function.py as a script using:

python MainDir/Folder1/function.py

you will not be able to use relative imports as suggested above. There are still many options available to you, as described here: How to import other Python files?

Import libraries from ROOT directory in python

1 Answers1

Invoking as a module

Invoking as a script

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