code: def getStrikes(self, contract_identifier, smin=None, smax=None):
          
          strikes = []
          contracts = self.contractDetails(contract_identifier)["contracts"]
  
          if contracts[0].m_secType not in ("FOP", "OPT"):
              return []
  
          # collect expirations
          for contract in contracts:
              strikes.append(contract.m_strike)
  
          # convert to floats
          strikes = list(map(float, strikes))
          # strikes = list(set(strikes))
  
          # get min/max
          if smin is not None or smax is not None:
              smin = smin if smin is not None else 0
              smax = smax if smax is not None else 1000000000
              srange = list(set(range(smin, smax, 1)))
              strikes = [n for n in strikes if n in srange]
  
          strikes.sort()
          return tuple(strikes)
docs: return strikes of contract / "multi" contract's contracts