docs: def username(self):
          """Loking for username in user's input and config file"""
          if len(self._inp_username.value.strip()) == 0: # if username provided by user
              if not self.hostname is None:
                  config = parse_sshconfig(self.hostname)
                  if 'user' in config: # if username is present in the config file
                      return config['user']
              else:
                  return None
          else:
              return self._inp_username.value