code: def add_instruments(self, *instruments):
          
          for instrument in instruments:
              if isinstance(instrument, ezibpy.utils.Contract):
                  instrument = self.ibConn.contract_to_tuple(instrument)
                  contractString = self.ibConn.contractString(instrument)
                  self.instruments[contractString] = instrument
                  self.ibConn.createContract(instrument)
  
          self.symbols = list(self.instruments.keys())
docs: add instruments after initialization