I am interested in using machine learning w/ python in an app I want to create.
I'm assuming here that you don't mean "running python in the device the app is targeted to alongside react" because that's a can of worms all by itself.
If you meant "integrate it with a server running python" then it's no different than integrating it with any other server. Like j said, just create an API, in python, your app can communicate with and you're done.
j
stuff ;)
an API ?
React native is a js vm + a bridge + native rendering. they are not related at all. so unless you write a python to JS parser this unlikely to happen on the phone.
go for the API which means you are frontend agnostic but there is no offline ML.