odenlls is a Python3 library for simulating and fitting chemical kinetics data using a combination of 1) ordinary differential equations (ODE) numerical simulations for an arbitrary set of chemical reactions and 2) non-linear least squares (NLLS) fitting techniques to determine best fit kinetic parameters.

Please see the GitHub repo for more detailed information. Several example Jupyter notebooks can be found here:

Irreversible first order reaction simulation
First order reaction fitting
First order reversible reaction kinetics
Or if you just want a quick overview without any explanation, see TLDR