'Python code for ozone reaction in FDM scheme

How can I use the Forward method for finite-time differencing to build a single box model for a third-order ODE?
Just so you know, I am a beginner in coding in general so if anyone could help me write a python code to find the lifetime of O varying with pressure for this ozone generation reaction, it would be greatly appreciated.

(P.S. what are the steps to code this in python using the FDM scheme?)

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python chemistry finite-difference

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