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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Section 2.1: Note on `python3 -m pytest` is incorrect","articleBody":"The note:\n\n```markdown\n## Why Run Pytest Using `python3 -m pytest` and Not `pytest`?\n\n`pytest` is another Python module that can be run via its own command but this is a good example\nwhy invoking Python modules via `python3 -m` may be better (recall the [explanation of Python interpreter's `-m` flag](12-virtual-environments.md)).\nHad we used `pytest tests/test_models.py` command directly,\nthis would have led to a \"ModuleNotFoundError: No module named 'inflammation'\" error. This is\nbecause `pytest` command (unlike `python3 -m pytest`) does not add the current directory to its list of\ndirectories to search for modules, hence the `inflammation` subdirectory's contents are not being\n'seen' by `pytest` causing the `ModuleNotFoundError`. There are ways to work around this problem\nbut `python3 -m pytest` ensures it does not happen in the first place.\n```\n\nThis is wrong. Counter example:\n\n```bash\npytest tests/test_models.py\n```\n\noutputs:\n\n```console\n=================================================== test session starts ====================================================\nplatform darwin -- Python 3.12.9, pytest-8.3.5, pluggy-1.5.0\nrootdir: /Users/***/Repos/github.com/***/python-intermediate-inflammation\nconfigfile: pyproject.toml\ncollected 2 items                                                                                                          \n\ntests/test_models.py ..                                                                                              [100%]\n\n==================================================== 2 passed in 0.06s =====================================================\n```\n\n### Environment\n\n- OS: macOS 15.3.2\n- See pytest output above\n","author":{"url":"https://github.com/alexlyttle","@type":"Person","name":"alexlyttle"},"datePublished":"2025-04-01T14:08:40.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/18/python-intermediate-development/issues/18"}