Lightning-Fast DataFrames with Polars

The Expression API

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Expressions: The Core Mental Model

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IN THIS LESSON

YOU’RE LEARNING TO

↗learner can transform DataFrames using select, with_columns, and filter

↗learner can build expressions with pl.col, arithmetic operators, and string methods

↗learner can use pl.when/then/otherwise for conditional logic

↗learner can chain multiple expressions in a single query