sigfig - Scientific Rounding

sigfig is a Python library (current version 1.3.19) designed for precise rounding of numbers based on significant figures, decimal places, or uncertainty. It also provides versatile formatting options and can interpret various numeric input types (e.g., strings, floats, Decimals). The library aims to provide expected rounding results in scientific and engineering contexts, often differing from Python's built-in `round()` function. It is actively maintained with releases as recent as March 2025.