polars.LazyFrame.explode#

LazyFrame.explode( columns: str | Expr | Sequence[str | Expr], *more_columns: str | Expr, ) → Self[source]#

Explode the DataFrame to long format by exploding the given columns.

Parameters:

columns: Column names, expressions, or a selector defining them. The underlying columns being exploded must be of the List or Array data type.
*more_columns: Additional names of columns to explode, specified as positional arguments.

Examples

>>> lf = pl.LazyFrame(
...     {
...         "letters": ["a", "a", "b", "c"],
...         "numbers": [[1], [2, 3], [4, 5], [6, 7, 8]],
...     }
... )
>>> lf.explode("numbers").collect()
shape: (8, 2)
┌─────────┬─────────┐
│ letters ┆ numbers │
│ ---     ┆ ---     │
│ str     ┆ i64     │
╞═════════╪═════════╡
│ a       ┆ 1       │
│ a       ┆ 2       │
│ a       ┆ 3       │
│ b       ┆ 4       │
│ b       ┆ 5       │
│ c       ┆ 6       │
│ c       ┆ 7       │
│ c       ┆ 8       │
└─────────┴─────────┘