[windows] UnicodeDecodeError: 'charmap' codec can't decode byte X in position Y: character maps to <undefined>

Stop wasting your time, just add the following encoding="cp437" and errors='ignore' to your code in both read and write:

open('filename.csv', encoding="cp437", errors='ignore')
open(file_name, 'w', newline='', encoding="cp437", errors='ignore')

Godspeed

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