polars.mean

polars.mean(*columns: str) → Expr

Get the mean value.

This function is syntactic sugar for pl.col(columns).mean().

Parameters:

*columns

One or more column names.

See also

mean_horizontal

Examples

>>> df = pl.DataFrame(
...     {
...         "a": [1, 8, 3],
...         "b": [4, 5, 2],
...         "c": ["foo", "bar", "foo"],
...     }
... )
>>> df.select(pl.mean("a"))
shape: (1, 1)
┌─────┐
│ a   │
│ --- │
│ f64 │
╞═════╡
│ 4.0 │
└─────┘
>>> df.select(pl.mean("a", "b"))
shape: (1, 2)
┌─────┬──────────┐
│ a   ┆ b        │
│ --- ┆ ---      │
│ f64 ┆ f64      │
╞═════╪══════════╡
│ 4.0 ┆ 3.666667 │
└─────┴──────────┘