polars.Expr.mean# Expr.mean() → Expr[source]# Get mean value. Examples >>> df = pl.DataFrame({"a": [-1, 0, 1]}) >>> df.select(pl.col("a").mean()) shape: (1, 1) ┌─────┐ │ a │ │ --- │ │ f64 │ ╞═════╡ │ 0.0 │ └─────┘