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Using nix-shell to start shells with Python packages

You can use nix-shell to quickly start shells with different versions of Python and Python packages availabl. nix-shell will make sure the referred packages are made available (built or downloaded) in the /nix/store, and start a shell with environment variables like PYTHONPATH set appropriately. For example:

Python 2.7 and NumPy

nix-shell -p python27Packages.numpy

In the shell started by nix-shell, check the versions:

  • run python --version
  • run python
    • type import numpy; numpy.__version__
    • Ctrl+D to exit python
  • Ctrl+D to exit nix-shell.

Python 3.8 and NumPy

nix-shell -p python36Packages.numpy

Check the versions as above.