| polars arg-where | Creates an expression that returns the arguments where expression is true.
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| polars as | Creates an alias expression.
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| polars col | Creates a named column expression.
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| polars concat-str | Creates a concat string expression.
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| polars datepart | Creates an expression for capturing the specified datepart in a column.
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| polars horizontal | Horizontal calculation across multiple columns.
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| polars is-in | Creates an is-in expression or checks to see if the elements are contained in the right series
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| polars lit | Creates a literal expression.
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| polars otherwise | Completes a when expression.
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| polars replace | Create an expression that replaces old values with new values
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| polars selector | Create column selectors for use in polars commands.
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| polars selector all | Creates a selector that selects all columns.
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| polars selector by-dtype | Creates a selector that selects columns by data type.
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| polars selector by-name | Creates a selector that selects columns by name.
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| polars selector ends-with | Select columns that end with the given substring(s).
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| polars selector first | Creates a selector that selects the first column(s) by index.
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| polars selector float | Select all float columns.
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| polars selector integer | Select all integer columns.
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| polars selector last | Creates a selector that selects the last column(s) by index.
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| polars selector matches | Select all columns that match the given regex pattern.
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| polars selector not | Inverts selector.
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| polars selector numeric | Select all numeric columns.
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| polars selector signed-integer | Select all signed integer columns.
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| polars selector starts-with | Select columns that start with the given substring(s).
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| polars selector unsigned-integer | Select all unsigned integer columns.
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| polars truncate | Divide the date/datetime range into buckets.
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| polars when | Creates and modifies a when expression.
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