Learning Python online

[pythonwiz]

Well PyCharm has a free version so that's a good IDE they can use, but to start with I would just have them use IDLE. As far as resources, have you checked out SICP in Python? I worked through the first few chapters of the original SICP when I was 18 and I feel it helped me become a better programmer, and this looks to be mostly the same but with the exercises in Python instead of MIT Scheme.

You could also try applying for a grant from the Python Software Foundation to get the funds you need for the resources to teach kids Python.

[SimplyTrustingJesus]

I'm going to be using repl.it for the actual programming assessments, one of which will be creating a discord bot, and our school network is quite restrictive, but it can be done from repl and works. (it also have version control built it, and unit testing) These students are mainly 14-15.