"""延迟导入"""
import importlib

_MODULES = ["institution", "rule", "quota"]


def __getattr__(name):
    if name in _MODULES:
        return importlib.import_module(f".{name}", __package__)
    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")


def __dir__():
    return list(_MODULES)