code: def find_working_password(self, usernames=None, host_strings=None):
          
          r = self.local_renderer
  
          if host_strings is None:
              host_strings = []
  
          if not host_strings:
              host_strings.append(self.genv.host_string)
  
          if usernames is None:
              usernames = []
  
          if not usernames:
              usernames.append(self.genv.user)
  
          for host_string in host_strings:
  
              for username in usernames:
  
                  passwords = []
                  passwords.append(self.genv.user_default_passwords[username])
                  passwords.append(self.genv.user_passwords[username])
                  passwords.append(self.env.default_password)
  
                  for password in passwords:
  
                      with settings(warn_only=True):
                          r.env.host_string = host_string
                          r.env.password = password
                          r.env.user = username
                          ret = r._local("sshpass -p '{password}' ssh -o StrictHostKeyChecking=no {user}@{host_string} echo hello", capture=True)
                          #print('ret.return_code:', ret.return_code)
              #             print('ret000:[%s]' % ret)
                          #code 1 = good password, but prompts needed
                          #code 5 = bad password
                          #code 6 = good password, but host public key is unknown
  
                      if ret.return_code in (1, 6) or 'hello' in ret:
                          # Login succeeded, so we haven't yet changed the password, so use the default password.
                          return host_string, username, password
  
          raise Exception('No working login found.')
docs: Returns the first working combination of username and password for the current host.