Don’t Write Polars Code with a Pandas Accent
summary
Shows concrete fixes: replace bracket selection with select and pl.col, prefer expressions and chaining over intermediate DataFrames, and use lazy frames so the optimizer does predicate and projection pushdown. Demonstrates a real speed change 31.3 ms vs 17.3 ms, uses tools like pl.sum_horizontal and selectors to add columns horizontally, and shows lazy workflows ending with lazy.collect. Provides runnable code patterns and a measurable before/after, not vague examples.
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chapters (11)
- 0:00Polars introduction
- 1:30Pandas accent mistakes
- 3:58Column selection mistake
- 5:45Overusing intermediate vars
- 10:43Chaining improves performance
- 11:46Eager execution mistake
- 15:35Horizontal column addition mistake
- 18:21Using drop vs exclude
- 19:23Idiomatic Polars recap
- 20:06Polars quiz
- 21:53Q&A
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