well, we also heavily use static typing, so you end up with something like my_db_conn: Lazy[DbConn] = Lazy(lambda: make_db_conn(...)) and MyPy will tell you i

well, we also heavily use static typing, so you end up with something like my_db_conn: Lazy[DbConn] = Lazy(lambda: make_db_conn(...)) and MyPy will tell you if you're doing something silly when you try to use it. EDIT: After typing up this response and submitting I realize you were talking about their strict approach rather than ours. whoops :)