code: def verify_param(self, param, must=[], r=None):
          '''return Code.ARGUMENT_MISSING if every key in must not found in param'''
          if APIKEY not in param:
              param[APIKEY] = self.apikey()
  
          r = Result() if r is None else r
          for p in must:
              if p not in param:
                  r.code(Code.ARGUMENT_MISSING).detail('missing-' + p)
                  break
  
          return f verify_param(self, param, must=[], r=None):
          '''return Code.ARGUMENT_MISSING if every key in must not found in param'''
          if APIKEY not in param:
              param[APIKEY] = self.apikey()
  
          r = Result() if r is None else r
          for p in must:
              if p not in param:
                  r.code(Code.ARGUMENT_MISSING).detail('missing-' + p)
                  break
  
          return r
docs: return Code.ARGUMENT_MISSING if every key in must not found in param