utils.py 文件源码

def __call__(self, *args):
    if not isinstance(args, collections.Hashable):
      # uncacheable. a list, for instance.
      # better to not cache than blow up.
      return self.func(*args)
    if args in self.cache:
      return self.cache[args]
    else:
      value = self.func(*args)
      self.cache[args] = value
      return value