Answers for "charmap' codec can't decode byte in position character maps to undefined"

UnicodeDecodeError: 'charmap' codec can't decode byte 0x9d in position 6148: character maps to <undefined>

Add encoding:
	
	file = open(filename, encoding="utf8")

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

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