Exercises 1-20

[billylanchantin]

Description

As discussed in Slack, this PR adds a translation of the first 20 exercises from the Python notebook 100 Numpy Exercises:

https://www.kaggle.com/code/utsav15/100-numpy-exercises/notebook

Changes

• Adds exercises-1-20.livemd file
• Tweaks the doc grouping in mix.exs
  

Notes

• Most of these first 20 translate 1-1. There were a few that didn't. I left comments (which we'll want to remove before merging).
• Going forward, not all of the exercises are going to make sense for Nx. This is (hopefully) more a jumping off point for community-curated exercises.

[polvalente]

Awesome work! I left some comments, but I'm really happy about the direction this guide is taking

[polvalente]

I accidentally approved instead of just leaving a general comment haha! This is overall great, but I think we should iterate and converge on the solutions for a bit more before merging

[billylanchantin]

@polvalente Ok, first pass at edits (thanks for reviewing!). A few thoughts:

1. 20 exercises at a time may be too much to iterate on. Perhaps the next PR can just be 10.
2. I resolved the comments that were rote. Usually I'd leave that up to the reviewer, but there are quite a few and I wanted to simplify the next round of edits.
3. The auto-formatter kept clobbering the numbers. Every time I'd make a change, it'd reset all the numbers to 1.. I've stopped fighting it for now. Hopefully we can think of a solution before the merge.

[billylanchantin]

Hey so I apologize for the churn here. I realize it makes this PR harder to review.

After some more discussion on slack, I think I'd like to reformat so solutions are wrapped in a <details> tag. That way you're not spoiled while you read.

I have these changes locally. If there are no objections, I'd like to push them:

[polvalente]

Hey so I apologize for the churn here. I realize it makes this PR harder to review.

After some more discussion on slack, I think I'd like to reformat so solutions are wrapped in a <details> tag. That way you're not spoiled while you read.

I have these changes locally. If there are no objections, I'd like to push them:

Go ahead! This PR isn't that large that a refactor like this would make it impossible to review again

[billylanchantin]

Ok, highlights:

• Each solution is inside a <details> tag. Now you won't get spoiled.
• All exercise wordings use the imperative mood. It felt better than some exercises being questions and others commands.
• I use the phrase "Example solution" for my solutions since there may be more than one. It also leaves it open for us to add "Example solution 1", "Example solution 2", etc. when there are multiple valid approaches.

[josevalim]

Sorry for the delay, I am (still) on holidays. I have dropped just two minor nits and we can ship it!

[josevalim]

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