code: def lock_up_period(self, lock_up_period):
          
          try:
              if isinstance(lock_up_period, (str, int)):
                  self._lock_up_period = int(lock_up_period)
          except Exception:
              raise ValueError('invalid input of lock up period %s, cannot be converted to an int' %
                               lock_up_period)
docs: This lockup period is in months.  This might change to a relative delta.