swmm_api

swmm_api, by Markus Pichler (TU Graz), covers the complete SWMM file surface in Python: parse and programmatically edit input files with every section typed, run the engine, and read both the report and binary output files back into pandas. Where PySWMM wraps the running engine, swmm_api treats the files themselves as first-class objects — which is exactly what bulk model refactoring, format conversion and reproducible model generation need.

It overlaps swmmio in spirit but goes deeper on INP fidelity (round-tripping models without losing sections), and its European user base has grown steadily. MIT-licensed, well documented, actively maintained.