polars.LazyFrame.groupby

LazyFrame.groupby(

by: IntoExpr | Iterable[IntoExpr],

*more_by: IntoExpr,

maintain_order: bool = False,

) → LazyGroupBy

Start a group by operation.

Deprecated since version 0.19.0: This method has been renamed to LazyFrame.group_by().

Parameters:

by

Column(s) to group by. Accepts expression input. Strings are parsed as column names.

*more_by

Additional columns to group by, specified as positional arguments.

maintain_order

Ensure that the order of the groups is consistent with the input data. This is slower than a default group by. Settings this to True blocks the possibility to run on the streaming engine.