Soon to be ex-Webfaction customer here. I got an email yesterday saying they can't migrate one of my apps, a Python WSGI custom app listening on a port, so now I'm looking.
The migration faq [0] says that there will be no capability to run Python based apps on the new tsoHost. I don't know if that extends to running Python via crontab, you would want to verify that with them.
OpalStack [1] looks appealing. It's built by former staff of Webfaction. I'm leaning in that direction, but also considering Digital Ocean, Linode, Heroku, Vultr [2], and some others I just learned about. Some do some of the host management for you. OpalStack is clearly a continuation of the Webfaction model so that will probably be my choice, but want to learn some more about these others too.
[0] https://www.webfaction.com/faq#which-features-will-not-be-av...