code: def crypt_salt_is_valid(salt):
      
      if len(salt) < 2:
          return False
      else:
          if salt[0] == '$':
              if salt[1] == '$':
                  return False
              else:
                  if '$' not in salt[1:]:
                      return False
                  else:
                      hashed = crypt.crypt("", salt)
                      if not hashed or '$' not in hashed[1:]:
                          return False
                      else:
                          return True
          else:
              return True
docs: Validate a salt as crypt salt
  
          :param str salt: a password salt
          :return: ``True`` if ``salt`` is a valid crypt salt on this system, ``False`` otherwise
          :rtype: bool