Polars course

[akshayka]

Description

We're building a course on Polars, and are seeking contributing authors! Contributors will be credited as authors in the course's directory, and in the notebooks they contribute.

Claiming a notebook.

Any notebook without an assigned author needs a contributor. To get started, leave a comment to claim a notebook you'd like to contribute, and then create a pull request with your draft. Tutorials with a "🍃" are meant to highlight marimo features that give Polars superpowers.

Notebook	Description	Status	Author
Why Polars	An introduction to Polars and its advantages over other Dataframe libraries.	✅	@koushikkhan
Dataframes	The central data structure for structured data	🚧
Loading data	Loading data from various different sources	✅
Basic operations	Basic operations on data	🚧	@jorammutenge
Reactive plots 🍃	How to select data from Altair or Plotly plots and get them back as dataframes	🚧	@etrotta
Dataframe transformer 🍃	Using marimo's built in table viewer and dataframe transformer	🚧
Querying dataframes with SQL 🍃	Using marimo's SQL cells to query Polars dataframes	🚧
Working with columns	Expression expansion and columns	🚧	@debajyotid2
Data types	Basic types and casting	🚧	@debajyotid2
Strings	Working with strings	✅	@peter-gy
Missing data	Handling missing data	🚧
Aggregations	Group bys and aggregations	✅	@jorammutenge
Window functions	Advanced expressions with windowing functions	✍️	@ngriffiths13
User-defined functions	Using custom Python operations	✅	@peter-gy
NumPy functions	Applying NumPy functions to Dataframes	🚧
Lazy execution	Lazily process queries with LazyFrames	🚧

[ngriffiths13]

I’d love to take some of these. Can I start with window functions?

[akshayka]

@ngriffiths13 Yes, please do! Thank you!

[jorammutenge]

I'm happy to take on Basic operations.

Can I get started on that?

[akshayka]

I'm happy to take on Basic operations.

Can I get started on that?

Definitely! Assigned that to you in the table.

[etrotta]

I'll try to take on Reactive plots

[debajyotid2]

I can take a look at Working with columns and Data types.

[akshayka]

Thank you @etrotta and @debajyotid2!

[peter-gy]

I would be glad to cover Strings and User-defined functions.

[jorammutenge]

I sent in a PR for "basic operations"

Can I take on Aggregations too?

[peter-gy]

Hey @akshayka 👋
The User-defined functions chapter has been merged with #57, could you please mark it with a ✅?

By the way, as the number of courses grows, it would be really cool to automate the chapter status reporting using GitHub workflows.

The Raycast Extensions repo could be a great source of inspiration, where each extension has assigned community members as maintainers. Structurally, this repo is relatively similar. Whenever a change is proposed to a particular course / chapter, the associated maintainers would be pinged under the PR to take a look. For now, this kind of tooling might be an overkill, but in the long term something similar could be interesting.

[akshayka]

@peter-gy, thanks for the ping — done!

By the way, as the number of courses grows, it would be really cool to automate the chapter status reporting using GitHub workflows ... Whenever a change is proposed to a particular course / chapter, the associated maintainers would be pinged under the PR to take a look.

That's an excellent idea — I like the idea of courses having owners, and I think it makes sense to invest in scalability of this repo long-term.

[Haleshot]

@ngriffiths13, @etrotta, @debajyotid2 Any updates in regard to the notebooks? Totally understand if things have been busy (work/otherwise), no rush at all! Let me know if you need anything from my side.

[etrotta]

Any updates in regard to the notebooks? Totally understand if things have been busy (work/otherwise), no rush at all! Let me know if you need anything from my side.

I had some issues with marimo and didn't have time to debug it, e.g. Run All not working (freezing/getting stuck) despite running each cell individually working, then got pretty busy to top it off

I will try again this weekend and ask in Discord if it is still happening on the latest version

[ngriffiths13]

@ngriffiths13, @etrotta, @debajyotid2 Any updates in regard to the notebooks? Totally understand if things have been busy (work/otherwise), no rush at all! Let me know if you need anything from my side.

Sorry just got home yesterday from a trip to Hawaii. Should be able to finish this next week!

[debajyotid2]

@Haleshot I'll submit a PR by next week!