Mathematic calculation in python using input file data as variables

I have an input file with weather data and am trying to use this data to calculate Evapotranspiration (evaporating water from surface of the earth). A link to a step by step calculation is attached below for your reference and the input file is also attached in the file section.

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Equation: https://edis.ifas.ufl.edu/pdf/AE/AE45900.pdf