ModuleNotFoundError: No module named 'sklearn'

How to fix ModuleNotFoundError: No module named 'sklearn'

Same name game: pip install scikit-learn, import sklearn. Run python -m pip install scikit-learn with the python you actually use. If pip says it is already there, your python and pip point at different environments; python -m pip fixes that class of problem permanently.

The exact error

ModuleNotFoundError: No module named 'sklearn'

Fix it

1. python -m pip install scikit-learn Expected: Successfully installed scikit-learn

2. python -c "import sklearn; print(sklearn.__version__)" Expected: prints a version

3. Check env match: python -c "import sys; print(sys.executable)". Expected: same env pip installed into

When this applies

import sklearn -> No module named 'sklearn'

When this does NOT apply

sklearn imports but a submodule is missing (version issue)

Versions

any

Why it happens

pip distribution name (scikit-learn) differs from import name (sklearn).

Edge cases

Do not pip install sklearn (a dummy package); always scikit-learn.