In decode return codecs charmap decode. Unicodedecodeerror: 'charmap' codec can't decode byte 0x98 in position 4: character maps to <undefined>. charmap codec can't encode character \x80. charmap' codec can't decode byte 0x98 in position 72852: character maps to <undefined>. 'charmap' codec can't encode character '\uff5c' in position 26950: character maps to <undefined>.