The python models for the paper:

Ausborn J, Shevtsova NA, Caggiano V, Danner SM, Rybak IA (2019) Computational modeling of brainstem circuits controlling locomotor frequency and gait. Elife
http://dx.doi.org/10.7554/eLife.43587

are available at their github repositories (same model at each):

https://github.com/SimonDanner/CPGNetworkSimulator https://github.com/elifesciences-publications/CPGNetworkSimulator