polars.Expr.count# Expr.count() → Self[source]# Count the number of values in this expression. Examples >>> df = pl.DataFrame({"a": [8, 9, 10], "b": [None, 4, 4]}) >>> df.select(pl.all().count()) # counts nulls shape: (1, 2) ┌─────┬─────┐ │ a ┆ b │ │ --- ┆ --- │ │ u32 ┆ u32 │ ╞═════╪═════╡ │ 3 ┆ 3 │ └─────┴─────┘