Add Polars lecture to complement existing Pandas lecture#408

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copilot/fix-407

Commits on Aug 31, 2025

Fix DuplicateError in Polars exercise join logic by using concat and pivot approach

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Commits on Sep 1, 2025

initial @mmcky review, in-work
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Commits on Sep 4, 2025

updates to series section
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Commits on Sep 5, 2025

edit round of DataFrames
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Commits on Sep 8, 2025

Update lectures/polars.md

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Update lectures/polars.md

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Update lectures/polars.md

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Update lectures/polars.md

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Update lectures/polars.md

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Update lectures/polars.md

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HumphreyYang
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Update lectures/polars.md

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HumphreyYang
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Update lectures/polars.md

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HumphreyYang
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Update lectures/polars.md

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HumphreyYang
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Update lectures/polars.md

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HumphreyYang
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Update lectures/polars.md

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HumphreyYang
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Update lectures/polars.md

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HumphreyYang
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Update lectures/polars.md

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HumphreyYang
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Update lectures/polars.md

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HumphreyYang
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Update lectures/polars.md

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HumphreyYang
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Update lectures/polars.md

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HumphreyYang
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Update lectures/polars.md

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HumphreyYang
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FIX: removed closing brackets
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add in cell fence removed from comments
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Merge branch 'main' into copilot/fix-407
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add in missing url
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Remove Exercises
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Commits on Oct 1, 2025

Merge branch 'main' into copilot/fix-407
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Commits on Oct 2, 2025

Merge branch 'main' into copilot/fix-407
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