not working on Python 3.7 about xortool HOT 3 CLOSED

xortool -h
xortool
  A tool to do some xor analysis:
  - guess the key length (based on count of equal chars)
  - guess the key (base on knowledge of most frequent char)

Usage:
  xortool [-x] [-m MAX-LEN] [FILE]
  xortool [-x] [-l LEN] [-c CHAR | -b | -o] [FILE]
  xortool [-x] [-m MAX-LEN| -l LEN] [-c CHAR | -b | -o] [FILE]
  xortool [-h | --help]
  xortool --version

Options:
  -x --hex                          input is hex-encoded str
  -l LEN, --key-length=LEN          length of the key
  -m MAX-LEN, --max-keylen=MAX-LEN  maximum key length to probe [default: 65]
  -c CHAR, --char=CHAR              most frequent char (one char or hex code)
  -b --brute-chars                  brute force all possible most frequent chars
  -o --brute-printable              same as -b but will only check printable chars
  -h --help                         show this help

Examples:
  xortool file.bin
  xortool -l 11 -c 20 file.bin
  xortool -x -c ' ' file.hex