polars.Expr.struct.json_encode

Expr.struct.json_encode() → Expr

Convert this struct to a string column with json values.

Examples

>>> pl.DataFrame(
...     {"a": [{"a": [1, 2], "b": [45]}, {"a": [9, 1, 3], "b": None}]}
... ).with_columns(pl.col("a").struct.json_encode().alias("encoded"))
shape: (2, 2)
┌──────────────────┬────────────────────────┐
│ a                ┆ encoded                │
│ ---              ┆ ---                    │
│ struct[2]        ┆ str                    │
╞══════════════════╪════════════════════════╡
│ {[1, 2],[45]}    ┆ {"a":[1,2],"b":[45]}   │
│ {[9, 1, 3],null} ┆ {"a":[9,1,3],"b":null} │
└──────────────────┴────────────────────────┘