What is the use of these files such as < Chen2020.py>

[TangLeiPlus]

hello everyone
I am a total beginner on Pybamm
I've got a question here. Please help.
There are some files like:
../pybamm/input/parameters/lithium_ion/Chen2020.py
this file consists of all the parameters which will be used in a simulation. I thought there might be a way for me to use this file to reset all the parameters in a simulation. But I found I can't use these files directly to change all the parameters.
I deleted all those file like Chen2020.py Ai2020.python Xu2019.py in the path above. After that, I rerun all the codes in the " example notebook", I found all the codes could run normally with no errors.
So I was wondering whether those files like "Chen2020.py" have any use.
Thanks in advance.

[rtimms]

These files contain the in-built parameter sets that ship with pybamm. See the documentation for more info on these sets and on how to add your own parameter sets.

These notebooks show how to use/edit parameter sets or define your own parameter sets directly in a notebook/script.