CODEWITHSUNDEEP
pythonpython-import
lanery
lanery

Reputation: 5364

ModuleNotFoundError on submodule

I realize that questions like this have been asked thousands and thousands of times, but I cannot figure out how to successfully import my data submodule.

MCVE

Directory structure

┌ dummy
├── setup.py
└─┬ dummy
  ├── __init__.py
  ├── foo.py
  └─┬ data
    ├── __init__.py
    └── data_bar.py

My top-level __init__.py contains

from .foo import *
from .data import *

and data/__init__.py is empty.

Recreate the problem

I pip install the package to a fresh virtual environment

pip install /path/to/dummy

which works fine. Then in an ipython shell run from a completely directory, I try importing the package

H:\Desktop$ ipython
In [1]: import dummy
---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-1-cfc16ef2ccc8> in <module>
----> 1 import dummy

C:\Users\rlane\AppData\Local\Continuum\miniconda3\envs\secdetect_test\lib\site-packages\dummy\__init__.py in <module>
      1 from .foo import *
----> 2 from .data import *

ModuleNotFoundError: No module named 'dummy.data'

foo.py imports without error, but after trying every conceivable variation of from .data import * I cannot get the code in the data submodule to load.

Things I've tried

Variations within top-level __init__.py

from .data import *
from data import *
from . import data
from .data import data_bar
from .data.data_bar import *

All of which result in the same ModuleNotFoundError.

Upvotes: 2

Views: 1581

Answers (2)

lanery
lanery

Reputation: 5364

The problem is that dummy.data is missing as a package in the setup.py script.

setup(
    name=DISTNAME,
    author=MAINTAINER,
    ...
    packages=[
        'dummy',
        'dummy.data'
    ],
    ...
    long_description=open('README.md').read(),
)

With this configuration, from .data import *, and from . import data in the top-level __init__.py both work.

Upvotes: 3

Tigran Fahradyan
Tigran Fahradyan

Reputation: 409

I have tried the same, but it worked for me.

This is my structure(note that all these files are in a folder called dummy).

enter image description here

Python files:

foo.py:

def foo_module():
    return 'foo module'

data_bar.py:

def data_bar_module():
    return 'Data bar'

test.py:

import dummy
#from dummy.data import data_bar

#print(dummy.foo.foo_module())
#print(data_bar.data_bar_module())

When I do python3 test.py it gives me no errors and when I uncomment the commented lines in test.py file it gives:

foo module
Data bar

I am not exactly sure why it does work, but try to import data package like this, it may work.

from dummy.data import *

Hope this was helpful.

Upvotes: 0

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