from functools import reduce from typing import Any, Callable, List identity = lambda x: x def compose(*fs: Callable[..., Any]) -> Callable[..., Any]: def compose2(f: Callable[..., Any], g: Callable[..., Any]) -> Callable[..., Any]: return lambda *a, **kw: f(g(*a, **kw)) return reduce(compose2, fs) def make_list(x: Any) -> List[Any]: return [x] if not isinstance(x, list) else x