pythonanywhere

https://www.pythonanywhere.com/

hosted python environments, for a webapp for your site, an on-the-go interpreter session, or... whatever else you can think of. i think they also give you bash and latex, maybe other goodies. it does have numpy, scipy, sympy, matplotlib, cython. it doen't have enthought, numba. the (very impressive) list of packages it has is here:
https://www.pythonanywhere.com/batteries_included/

free for basic account, $5/mo for 'hacker' account, and 12$/mo for more serious hosting. sounds very reasonable, considering you get access to their hardware and no wasting time on sysadmin maintenance.

demo console here:
http://blog.pythonanywhere.com/4/

run selenium test example here:
http://blog.pythonanywhere.com/3/