not working on Python 3.7

[art3mHQ]

Not working properly on Python 3.7
even with this patch #16

eg:
art3mk@akmac:xortool$ xortool encryptedtext -l 24 -c 20
2 possible key(s) of length 24:
\n\x0c\x1a\x1e\x11\x10\x11\x06\x12\x16\x05\x1a\r\x0c\x16\x0c\r\x16\x18\x17\x0b\x08\x1e\x06
\n\x0c\x1a\x1e\x11\x10\x11\x06\x12\x16\x05\x1a\r\x0c\x16\x0c\r\x16\x18\x17\x0b2\x1e\x06
Traceback (most recent call last):
File "/usr/local/bin/xortool", line 381, in
main()
File "/usr/local/bin/xortool", line 71, in main
produce_plaintexts(ciphertext, probable_keys, key_char_used)
File "/usr/local/bin/xortool", line 349, in produce_plaintexts
key_repr = alphanum(key)
File "/usr/local/lib/python3.7/site-packages/xortool/routine.py", line 95, in alphanum
if char in (string.letters + string.digits):
AttributeError: module 'string' has no attribute 'letters'

after changing "letters" to "ascii_letters"

art3mk@akmac:xortool$ xortool encryptedtext -l 24 -c 20
2 possible key(s) of length 24:
\n\x0c\x1a\x1e\x11\x10\x11\x06\x12\x16\x05\x1a\r\x0c\x16\x0c\r\x16\x18\x17\x0b\x08\x1e\x06
\n\x0c\x1a\x1e\x11\x10\x11\x06\x12\x16\x05\x1a\r\x0c\x16\x0c\r\x16\x18\x17\x0b2\x1e\x06
Traceback (most recent call last):
File "/usr/local/bin/xortool", line 381, in
main()
File "/usr/local/bin/xortool", line 71, in main
produce_plaintexts(ciphertext, probable_keys, key_char_used)
File "/usr/local/bin/xortool", line 349, in produce_plaintexts
key_repr = alphanum(key)
File "/usr/local/lib/python3.7/site-packages/xortool/routine.py", line 97, in alphanum
lst[index] = char.encode("hex")
LookupError: 'hex' is not a text encoding; use codecs.encode() to handle arbitrary codecs

xortool_out folder files are empty (just headers in there)

[noraj]

I takes a file not a string in argument.

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

[maage]

Also #26 fixes this issue.

[hellman]

I think should work now on master (not on PyPI yet)