to me the most interesting part is "contexts" https://pint.readthedocs.io/en/stable/contexts.html https://pint.readthedocs.io/en/stable/contexts.html where you

to me the most interesting part is "contexts" https://pint.readthedocs.io/en/stable/contexts.html https://pint.readthedocs.io/en/stable/contexts.html where you can define relationships to convert between things like wavelength-frequency or time-frequency.