Serverless[0] does support Python (the CLI tools are just written in JS). Zappa[1] is also a great option if you want to deploy a WSGI compatible app (flask/django) to Lambda.
I've used them both in production and have had a great experience.
[0] https://serverlesscode.com/post/python-on-serverless-intro/ [1] https://github.com/Miserlou/Zappa