password_test.py

import re

_HASH_RE = re.compile(r'[^a-zA-Z0-9./=]')
fields = "$6$7XhBc13.5MtmI1MQ$l4hdVQnszutOZxKYU/Ih5i9w9eFAIwMK4Nu9nDLrSTaD.p6eHhMgD.2C2s/PZhqTdqv8mk1/MDhHyWSW/HFly0".split("$")
maybe_invalid = False
if len(fields) >= 3:
    # contains character outside the crypto constraint
    if bool(_HASH_RE.search(fields[-1])):
        maybe_invalid = True
    # md5
    if fields[1] == '1' and len(fields[-1]) != 22:
        maybe_invalid = True
    # sha256
    if fields[1] == '5' and len(fields[-1]) != 43:
        maybe_invalid = True
    # sha512
    if fields[1] == '6' and len(fields[-1]) != 86:
        maybe_invalid = True
else:
    maybe_invalid = True
if maybe_invalid:
    print("The input password appears not to have been hashed. "
                     "The 'password' argument must be encrypted for this module to work properly.")