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Depending how you installed Sage, Sage's Python might not be the system Python.

Installing Python packages for one Python does not install them for the other one.

To install the desired package for Sage's Python:

sage --pip install python-ternary

Depending how you installed Sage, Sage's Python might not be the system Python.

Installing Python packages for one Python does not install them for the other one.

Beware also that there are two different packages on PyPI with similar names:

• https://pypi.org/project/ternary/
• https://pypi.org/project/python-ternary/

I think you want the second one.

To install the desired package for Sage's Python:

sage --pip install python-ternary

sage --pip uninstall ternary