polars.Expr.append#

Expr.append(other: Expr, upcast: bool = True) Expr[source]#

Append expressions.

This is done by adding the chunks of other to this Series.

Parameters:
other

Expression to append.

upcast

Cast both Series to the same supertype.

Examples

>>> df = pl.DataFrame(
...     {
...         "a": [8, 9, 10],
...         "b": [None, 4, 4],
...     }
... )
>>> df.select(pl.all().head(1).append(pl.all().tail(1)))
shape: (2, 2)
┌─────┬──────┐
│ a   ┆ b    │
│ --- ┆ ---  │
│ i64 ┆ i64  │
╞═════╪══════╡
│ 8   ┆ null │
├╌╌╌╌╌┼╌╌╌╌╌╌┤
│ 10  ┆ 4    │
└─────┴──────┘