Change python intro to use files

[phalt]

Changes to the Python Introduction chapter to use files when things get more complex.

This reshuffles the code editor chapter to between the Python installation and Python introduction chapters.

Reading through the tutorial, it felt like the interpreter was a good choice up until conditional loops and functions were introduced, so I didn't rewrite the whole thing. I did however add a small section on getting the code editor open and why we are switching to it at that point (see line 396 and onwards in python_introduction/README.md)

Closes #207 and #190

🎁

[olasitarska]

I think here we need to make sure that they are in the right directory (desktop) or tell them how to go to this directory (they learned cd commands in intro to command line)

[phalt]

Okay, I wasn't sure if they fully understood this yet. Better to be explicit here. I'll make a change.

[olasitarska]

Thanks for this awesome contribution @phalt! Really well done. I am nitpicking on two things, what do you think?

@bmispelon it'd be awesome if you would have 10 minutes to see if I missed something :)

[MarkusH]

I haven't looked through the entire tutorial, but as far as I can remember we use double quotes " for string most the time. This would reduce confusion if we stick to them here as well.

[phalt]

Actually it looks like a lot of the tutorial uses single quotes. Happy to change it. Can we get a definitive on this please @olasitarska? Single or double quotes?

[olasitarska]

I think we haven't ever made that decision. Can you check what this chapter is using and adjust to that?

[bmispelon]

My general guideline is: single quotes for machine-readable strings and double quotes for human readable ones.

It might be nice to be more consistent about this through the tutorial but I think that's out of scope for this PR.

Also note that we do explain the two syntax at the beginning of this chapter and in my exprience, I haven't seen much confusion about this in practice.

[bmispelon]

I will give this a thorough review later in the evening.

Thanks for tackling this, Paul. Much appreciated ❤️

[bmispelon]

Shouldn't this be before the previous paragraph?

[phalt]

Cleared this up, it should print out "Hi anonymous" this time, but I can see why there was confusion.

[bmispelon]

I left a few comments here and there but this is a really awesome contribution!

As I mentionned in #210, I think we could switch to file-based execution right before we introduce the print() function.
However, this PR stands on its own and I'd be happy to merge it in its current state (well, after you remove all the if __name__ == '__main__' as noted in my comments :) ).

Thanks again!

[phalt]

Updates should have been pushed up now:

• Removed all the if __name__ == '__main__' stuff
• Cleared up the hi() function
• Removed explanation of colons in favour of "this is how if and for work"

[bmispelon]

Thank you! 💖

[olasitarska]

Yay! ✨ 🎉

[phalt]

😄