_bootstrap.py 文件源码

def _install(sys_module, _imp_module):
    """Install importlib as the implementation of import."""
    _setup(sys_module, _imp_module)

    sys.meta_path.append(BuiltinImporter)
    sys.meta_path.append(FrozenImporter)

    global _bootstrap_external
    import _frozen_importlib_external
    _bootstrap_external = _frozen_importlib_external
    _frozen_importlib_external._install(sys.modules[__name__])