ModuleNotFoundError: No module named 'llvmlite'

TL;DR: numba needs the llvmlite package and it is not installed. Run pip install llvmlite (or reinstall numba, which pulls it in) and the import works.

The error

ModuleNotFoundError: No module named 'llvmlite'

Fix it

1. Install llvmlite:

   pip install llvmlite

Expected: install completes.

1. Verify:

   python -c "import numba; print(numba.__version__)"

Expected: prints the version, no error.

1. If it still fails, reinstall numba so pip resolves the pair together:

   pip install --force-reinstall numba

When this applies

Use this when import numba raises the llvmlite error, common after a partial install or a botched upgrade.

When it does not apply

If llvmlite is installed but numba still fails, the versions may be mismatched; reinstall both together. If the error names a different module, that is a separate issue.

Compatibility

All numba versions; each numba release requires a specific llvmlite version, so install them as a pair.

Root cause

numba compiles Python to machine code through LLVM, and llvmlite is its LLVM binding layer. It is a hard dependency, but partial installs and --no-deps installs can leave it out.

Edge cases

On conda, install both from conda-forge to keep the LLVM builds consistent. Very new Python versions may need a newer numba/llvmlite pair than your pins allow.