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Re:Show HN: Futurecoder – A free online interactive Python c... by tomcooks on Sunday October 03, 2021 @06:29PM (#28741080)
Congratulations, this is really a nice project.

Beware, when signing up with my email the white overlay signup container became empty (full width, a few pixels tall, no content inside). I clicked outside it to close it, header still showing the blue login/sign up button.

Reloading the page showed me as logged in (my email in the header)

Re:Show HN: Futurecoder – A free online interactive Python c... by alexmojaki on Sunday October 03, 2021 @06:43PM (#28741176)
Thanks for pointing this out, will investigate.
Re:Show HN: Futurecoder – A free online interactive Python c... by anadem on Sunday October 03, 2021 @10:18PM (#28742319)
ditto (firefox 92.0.1)

and I can't get past 'hello' + 'world' .. there's no Next button, only Previous

Re:Show HN: Futurecoder – A free online interactive Python c... by alexmojaki on Monday October 04, 2021 @08:56AM (#28746057)
At every step, you need to run code to advance. On that page (https://futurecoder.io/course/#AddingStrings) you first need to run `'hello' + 'world'` in the shell as instructed. The next step is an exercise: you have to output the same thing with a space in between words, so code such as `'hello' + ' ' + 'world'` is accepted. The 'Next' button only appears at the end of the page.

You're not the first person I've seen get confused about this, I'll need to find a way to make it clearer that the interface is waiting for you to run something.