Add range-len tag

[swfarnsworth]

This would be a message we could whip out when we see range(len(...)) for loops during help sessions. I intentionally left out a lot of interesting details to keep the message concise.

I recall there being a RealPython article about "pythonic loops" and was hoping to link to it, but it looks like it's now paid content. I saw that our guides are under construction and I'd be happy to write a guide on loops with an emphasis on pythonicness.

I don't know that linking to the official Python docs is a digestible resource for some learners, especially those who don't have experience in other languages, so I'm very much open to alternatives for those.

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[kwzrd]

Here's what the tag ends up looking like in Discord:

I think this is well written and I'm happy to approve it.

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Some tags that we have will show an interactive session to demonstrate what the output looks like, for example:

This gives a more tangible example of the discussed practices, but it comes at the cost of making the embed (perhaps needlessly) bigger. I don't mind either way, I'm happy with the current approach, just wanted to mention this in case you end up preferring it.

Either way, good job!

[swfarnsworth]

@kwzrd I see what you're saying about displaying the REPL output. I think people who use range(len(...)) are familiar with iteration in general (and probably use it that way in a C-style language); if the concept of iteration itself is where they're struggling, they probably don't know why they have range(len(...)) in their code, and a tailored approach would be needed to teach them that concept. If we find that the current message isn't effective, we could see if a REPL display is what would trigger the aha moment for them.

[Den4200]

Looks good! However, since we do have !zip and !enumerate tags, maybe they could be mentioned in this tag?

[swfarnsworth]

@Den4200 Do we have any other messages that suggest that you run a command to get another message? The idea sounds a bit weird to me, but our messages would probably be more informative for our intended audience than the Python docs.

[Den4200]

Hmm, I don't think there are any tags that mention other ones. It's just the docs from what I can tell, so I'll leave it up to you to decide.

[Den4200]

After some discussion in #organisation, it looks like the tag is ready to go.