__init__.py 文件源码

def __getitem__(self, alias):
        try:
            return self._caches.caches[alias]
        except AttributeError:
            self._caches.caches = {}
        except KeyError:
            pass

        if alias not in settings.CACHES:
            raise InvalidCacheBackendError(
                "Could not find config for '%s' in settings.CACHES" % alias
            )

        cache = _create_cache(alias)
        self._caches.caches[alias] = cache
        return cache