Slam is a simple command-line utility that makes it very easy to do serverless deployments of Python web applications to AWS, using the Lambda and API Gateway services. In particular, Slam supports the transparent deployment of WSGI compliant applications.
If you have 10 minutes to spare, you can watch a (now slightly outdated) screencast in which the main features of slam are demonstrated:
Or if you prefer something more formal, have a look at the documentation, which also includes a written tutorial.