Python 3 inter-project imports do not work

Question

I have a directory structure like the following:

project/
    README.md
    project/
        foobar/
            foo.py
        tests/
            test_foo.py

test_foo is just from foobar import foo and when I run py.test or just python3 tests/test_foo.py from the project subdirectory, I get a No module named foobar error. I tried the other answers here such as adding .. to sys.path, using relative imports, none work, except when running python3 test_foo.py inside tests with sys.path.append('..').

You need an `__init__.py` in a directory if you wish to import it as a module. — meowgoesthedog, Dec 27 '18 at 12:12
@meowgoesthedog not since 3.3 AFAIK. and i did try it, no difference. — shamilpython, Dec 27 '18 at 12:20
[`touch project/project/conftest.py`](https://stackoverflow.com/a/50610630/2650249) — hoefling, Dec 27 '18 at 13:26
alright, this fixes the import problem. However, if i have another file `bar.py` with the `Bar` class, it can't import that from `foo.py`. Executing `foo.py` raises no errors. — shamilpython, Dec 27 '18 at 14:37

score 0 · Answer 1 · answered Dec 27 '18 at 12:14

0

First make a package from your project and install it.

If installed, you can simply use absolute links, started with your package name:

from project import foobar
from project.foobar import foo

Another way - use intra-package links (no modification to sys.path needed):

test_foo.py

from .. import foobar

answered Dec 27 '18 at 12:14

grapes

8,185
1
19
31

The problem is that my project is not a library, so i'm not making a standard distutils setup.py – shamilpython Dec 27 '18 at 12:19

score 0 · Answer 2 · answered Dec 27 '18 at 12:22

0

foo.py

def test():
    print("test")

test_foo.py

import os
import sys

runPath = os.path.dirname(os.path.realpath(__file__))
sys.path.append(os.path.join(runPath, ".."))

from foobar import foo

foo.test()

Output

test

answered Dec 27 '18 at 12:22

Ali.Turkkan

266
2
11

two issues, adding paths to `sys.path` is "generally not recommended" and it would be cumbersome to paste that into every test file. – shamilpython Dec 27 '18 at 12:24

Python 3 inter-project imports do not work

2 Answers2

foo.py

test_foo.py

Output