Python 3 UnicodeDecodeError: 'charmap' codec can't decode byte 0x9d
In Python 3, files are opened as text (decoded to Unicode) for you; you don't need to tell BeautifulSoup what codec to decode from.
If decoding of the data fails, that's because you didn't tell the open() call what codec to use when reading the file; add the correct codec with an encoding argument:
with open(filename, encoding='utf8') as infile:
html = BeautifulSoup(infile, "html.parser")
otherwise the file will be opened with your system default codec, which is OS dependent.