Self-reply: I found these two but haven't tried them. https://github.com/pelotom/runtypes https://github.com/pelotom/runtypes https://github.com/ianstormtaylo

Self-reply: I found these two but haven't tried them. https://github.com/pelotom/runtypes https://github.com/pelotom/runtypes https://github.com/ianstormtaylor/superstruct https://github.com/ianstormtaylor/superstruct