Function eval_expression

lib/sqlalchemy/util/typing.py:240–273

(
    expression: str,
    module_name: str,
    *,
    locals_: Optional[Mapping[str, Any]] = None,
    in_class: Optional[Type[Any]] = None,
)

def eval_expression(
    expression: str,
    module_name: str,
    *,
    locals_: Optional[Mapping[str, Any]] = None,
    in_class: Optional[Type[Any]] = None,
) -> Any:
    try:
        base_globals: Dict[str, Any] = sys.modules[module_name].__dict__
    except KeyError as ke:
        raise NameError(
            f"Module {module_name} isn't present in sys.modules; can't "
            f"evaluate expression {expression}"
        ) from ke

    try:
        if in_class is not None:
            cls_namespace = dict(in_class.__dict__)
            cls_namespace.setdefault(in_class.__name__, in_class)

            # see #10899.  We want the locals/globals to take precedence
            # over the class namespace in this context, even though this
            # is not the usual way variables would resolve.
            cls_namespace.update(base_globals)

            annotation = eval(expression, cls_namespace, locals_)
        else:
            annotation = eval(expression, base_globals, locals_)
    except Exception as err:
        raise NameError(
            f"Could not de-stringify annotation {expression!r}"
        ) from err
    else:
        return annotation


def eval_name_only(