invert_quantity
invert_quantity(
unit: str | bytes | pint.registry.Quantity | pint.facets.plain.unit.PlainUnit | numpy.datetime64 | numpy.timedelta64 | int | float | ellipsis | None[str, <class ’bytes, Quantity, PlainUnit, datetime64, timedelta64, int, float, <class ’ellipsis, None] ,
)-> ‘Quantity | None’
Invert a unit.