Pint: Physical Quantities

Pint is a Python package designed for defining, operating, and manipulating physical quantities. It allows for arithmetic operations between numerical values and units of measurement, as well as conversions between different units. The library includes a comprehensive list of physical units, prefixes, and constants, and its modular design enables users to extend or rewrite unit definitions. It integrates well with numerical libraries like NumPy and Pandas (via `pint-pandas`) and is actively maintained, with the latest stable version 0.25.3 released on March 19, 2026.