code: def output(self, _filename):
          
  
          txt = "Analyze of {}\n".format(self.slither.filename)
          txt += self.get_detectors_result()
          for contract in self.slither.contracts_derived:
              txt += "\nContract {}\n".format(contract.name)
              txt += self.is_complex_code(contract)
              is_erc20 = contract.is_erc20()
              txt += '\tNumber of functions:{}'.format(self._number_functions(contract))
              txt += "\tIs ERC20 token: {}\n".format(contract.is_erc20())
              if is_erc20:
                  txt += self.get_summary_erc20(contract)
  
          self.info(txt)
docs: _filename is not used
              Args:
                  _filename(string)