Can't get past import serial

New to Hassbian. How do I get my custom_component .py scripts to recognize import serial?

Throws error: ImportError: No module named ‘serial’

You have to add it as a requirement to a pypi library
I.e. if you want to go asyncio ( adapt for standard serial)

REQUIREMENTS = [‘pyserial-asyncio==0.4’]

Thank you for the reply!