Answers for ""fileinput.input" unicodedecodeerror: 'charmap' codec can't decode byte 0x90 in position 7818: character maps to <undefined>"

UnicodeDecodeError: 'charmap' codec can't decode byte 0x9e in position 3359: character maps to <undefined>

#add the encoding parameter for open method
with open(filename, encoding='utf8') as infile:

UnicodeDecodeError: 'charmap' codec can't decode byte 0x81 in position 92: character maps to <undefined>

file = open(filename, encoding="cp437")