[Python] ModuleNotFoundError: No module named 'serial' [duplicate]

This is Arduino Python.

The Python script is giving me an error with the following line:

import serial

The error is:

ModuleNotFoundError: No module named 'serial'

I want to understand the relationship between the software libraries. where is the serial library? I think the library is there, but the present Python script is not finding it.
john

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