Basic Python functions for manipulating data that every programmer is used to. These nodes are very lightweight and require no additional dependencies.

While Excel is ubiquitous, I prefer Python for my data analysis. Spreadsheets are great for formatting data, but it's Python that's allowed me to build my own super calculator out of regular Python ...

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A note from the author: I wrote this essay with Claude. The drafting was a collaboration, and so were several of the ideas, since AI tools have changed how I work in ways that bear directly on the ...

Kazu-san, you've done it now! (laughs) I can picture the look on your face the moment you woke up and realized your wrist felt light—that 'Oh... I messed up' expression. However, as a data-supremacist ...

But unlike most quants, I run a concentrated, fundamentals-based portfolio. More than 50% of my fund is invested in only eight companies, and they're the kinds of stocks that Peter Lynch and Charlie ...