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from importlib import import_module
from types import ModuleType
from typing import Any, Dict, List
# https://github.com/tensorflow/tensorflow/blob/master/tensorflow/
# python/util/lazy_loader.py
class LazyLoader(ModuleType):
def __init__(
self,
local_name: str,
parent_module_globals: Dict[str, Any],
name: str,
) -> None:
self._local_name = local_name
self._parent_module_globals = parent_module_globals
super().__init__(name)
def _load(self) -> Any:
module = import_module(self.__name__)
self._parent_module_globals[self._local_name] = module
self.__dict__.update(module.__dict__)
return module
def __getattr__(self, item: str) -> Any:
module = self._load()
return getattr(module, item)
def __dir__(self) -> List[str]:
module = self._load()
return dir(module)
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