| 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 alpha | Select all columns with alphabetic names (eg: only letters). Matching column names cannot contain *any* non-alphabetic characters. Note that the definition of "alphabetic" consists of all valid Unicode alphabetic characters by default; this can be changed by setting `--ascii-only`.
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| polars selector alphanumeric | Select all columns with alphanumeric names (eg: only letters). Matching column names cannot contain *any* non-alphanumeric characters. Note that the definition of "alphanumeric" consists of all valid Unicode alphanumeric characters by default; this can be changed by setting `ascii_only=true`.
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| polars selector array | Select all array columns. Optionally filter by fixed width.
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| polars selector binary | Select all binary columns.
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| polars selector boolean | Select all boolean 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-index | Select columns by their index position. Supports negative indices (e.g., -1 for the last column).
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| polars selector by-name | Creates a selector that selects columns by name.
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| polars selector categorical | Select all categorical columns.
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| polars selector contains | Select columns whose names contain the given literal substring(s).
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| polars selector date | Select all date columns.
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| polars selector datetime | Select all datetime columns. Optionally filter by time unit (ns, us, ms) and/or timezone.
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| polars selector decimal | Select all decimal columns.
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| polars selector digit | Select columns whose names consist entirely of digit characters. By default uses Unicode decimal digits; use `--ascii-only` to restrict to ASCII 0-9.
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| polars selector duration | Select all duration columns. Optionally filter by time unit (ns, us, ms).
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| polars selector empty | Create an empty selector that matches no columns. Useful as a base for selector composition.
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| polars selector ends-with | Select columns that end with the given substring(s).
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| polars selector enum | Select all enum columns.
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| polars selector exclude | Select all columns except those with the given name(s). This is the inverse of `polars selector by-name`.
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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 list | Select all list columns.
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| polars selector matches | Select all columns that match the given regex pattern.
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| polars selector nested | Select all nested columns (list, array, or struct).
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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 object | Select all object 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 string | Select all string columns. Use `--include-categorical` to also select categorical columns.
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| polars selector struct | Select all struct columns.
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| polars selector temporal | Select all temporal columns (date, datetime, duration, and time).
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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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