pwlf: Piecewise Linear Fitting

pwlf is a Python library (v2.5.2) for fitting continuous piecewise linear functions to 1D data. It allows users to specify the number of line segments and uses global optimization (like differential evolution or L-BFGS-B) to find optimal breakpoint locations. The library also supports fitting with known breakpoints, constrained fits, and provides statistical properties like standard errors and R-squared values. It is actively maintained with regular releases.