Install pytest inside the virtual environment.

Activate your project’s virtual environment.

Simply uninstall pytest from your system and only install it within a virtualenv when you need it.

Run pytest and get your ModuleNotFoundError!įixing pytest and the ModuleNotFoundError.

If you check pytest and the package, it will give you your first hint that there’s a problem - notice where pytest is located versus where the package is located: $ pytest -version This is pytest version 4.1.0, imported from /usr/local/lib/python3.7/site-packages/pytest.py $ pip install requests Requirement already satisfied: requests in /Users/username/.local/share/virtualenvs/satsuki-7xyz/lib/python3.7/site-packages (2.21.0)

You should now be able to see both pytest and the package.

Install the package in the virtual environment.

Activate a virtual environment for your project that needs the package.

Now, make sure that the package you need is not installed system wide.

Install pytest outside of all virtual environments.

Here’s how you could recreate the problem: If you have installed pytest system-wide, in other words, outside of a virtual environment, pytest has a nasty habit of only looking outside your virtual environment for modules! If your project is using a module that is only installed in your virtual environment, and you’re using a system-wide pytest, it won’t find the module, even if you’ve activated the virtual environment. The issue is which pytest you are using and your use of a virtual environment. Reinstalling your virtual environment won’t fix it. Installing, uninstalling, and reinstalling won’t fix this. This issue is not the module or package you’re trying to use. You can even prove it is there: $ pip install requests Requirement already satisfied: requests in /Users/username/.local/share/virtualenvs/satsuki-7hJc15h4/lib/python3.7/site-packages (2.21.0) Why is pytest cursing me with the ModuleNotFoundError? The point is, pytest says the module is not found but you are sure it exists. Instead of Requests, maybe you’re missing Scrapy or Pyglet or NumPy or Pandas. Traceback: tests/test_satsuki.py:10: in import requests E ModuleNotFoundError: No module named 'requests' Hint: make sure your test modules/packages have valid Python names. This is the error you might have seen: _ ERROR collecting tests/test_satsuki.py _ tests/test_satsuki.py:10: in import requests E ModuleNotFoundError: No module named 'requests' _ ERROR collecting tests/test_satsuki.py _ ImportError while importing test module '/Users/username/dev/satsuki/tests/test_satsuki.py'.

Pycharm no module named numpy