Import Error in Python2.7 but not in Python3

Question

I've got a python package written locally with a structure like

package
├── __init__.py
├── __main__.py
├── tests
│   ├── __init__.py
│   └── package_tests.py
└── package
    ├── __init__.py
    ├── package.py

This works great when run using python -m package in a Python3 virtualenv from the root of the project (parent dir of the first package dir in that tree)

However when run in a Python2.7 virtualenv, I get an ImportError in the __main__.py script as it tries to import the functions from package.py

__main__.py:

import sys
from package.package.package import foo, bar


    def main(args):
        f = foo(args)
        bar(f)


    if __name__ == "__main__":
        main(sys.argv[1:])

The error:

ImportError: No module named package

What do I need to change to make it compatible with both?

(Obviously the package isn't actually called package)

have you tried to print sys.argv in both pythons? Is there any difference? — Olvin Roght
– Olvin Roght, Commented Jul 17, 2019 at 11:19
try to rename the inner folder package to something else, and see it it works for both — Urban48
– Urban48, Commented Jul 17, 2019 at 11:20
sys.argv worked fine in both versions, it was the relative imports that were the issue @OlvinRoght — Jordan Mackie
– Jordan Mackie, Commented Jul 17, 2019 at 11:24

Jordan Mackie · Accepted Answer · 2019-07-17 11:20:53Z

1

Despite looking for an explanation for so long, immediately after posting this question I found a solution.

After looking over the changes to imports between python 2 and 3 I found that I only needed to use relative imports.

So the import line in my __main__.py became from .package.package import foo, bar

answered Jul 17, 2019 at 11:20

Jordan Mackie

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