code: def get(self):
          
          with self._lock:
              now = datetime.now()
              active = []
              for i, vef in enumerate(self.futures):
                  # has expired
                  if (vef[1] or datetime.max) <= now:
                      self.futures.pop(i)
                      continue
                  # in future
                  elif (vef[2] or datetime.min) >= now:
                      continue
                  else:
                      active.append(i)
  
              if active:
                  # this will evict values old values
                  # because new ones are "more recent" via future
                  value, _e, _f = self.futures[active[-1]]
                  for i in active[:-1]:
                      self.futures.pop(i)
                  return value
  
              raise ValueError("dicttime: no current value, however future has (%d) values" % len(self.futures))
docs: Called to get the asset values and if it is valid