cache.py 文件源码

def _find_generators(self, item):
        """ A recursive function to flatten generators into lists """
        try:
            result = []
            # Make sure dicts aren't flattened to lists
            if isinstance(item, dict):
                result = {}
                for i in item:
                    result[self._find_generators(i)] = self._find_generators(item[i])
                return result

            # Since NoneObjects and strings are both iterable, treat them specially
            if isinstance(item, obj.NoneObject) or isinstance(item, str):
                return item

            if isinstance(item, types.GeneratorType):
                raise CacheContainsGenerator
            for x in iter(item):
                flat_x = self._find_generators(x)
                result.append(flat_x)

            return result
        except TypeError:
            return item