文本挖掘UnicodeDecodeError：'charmap‘编解码器无法解码位置1671718中的字节0x81 :字符映射到<undefined>

with open('your_file.txt', 'r', encoding='utf-8') as file:
    content = file.read()

import chardet

with open('your_file.txt', 'rb') as file:
    raw_data = file.read()
    encoding = chardet.detect(raw_data)['encoding']
    content = raw_data.decode(encoding)

import codecs

with codecs.open('your_file.txt', 'r', encoding='utf-8') as file:
    content = file.read()

with open('your_file.txt', 'r', encoding='charmap', errors='replace') as file:
    content = file.read()

with open('your_file.txt', 'r', encoding='charmap', errors='ignore') as file:
    content = file.read()