polars.LazyFrame.deserialize#

classmethod LazyFrame.deserialize(source: str | Path | IOBase) → Self[source]#

Read a logical plan from a JSON file to construct a LazyFrame.

Parameters:

source: Path to a file or a file-like object (by file-like object, we refer to objects that have a read() method, such as a file handler (e.g. via builtin open function) or BytesIO).

See also

LazyFrame.serialize

Examples

>>> import io
>>> lf = pl.LazyFrame({"a": [1, 2, 3]}).sum()
>>> json = lf.serialize()
>>> pl.LazyFrame.deserialize(io.StringIO(json)).collect()
shape: (1, 1)
┌─────┐
│ a   │
│ --- │
│ i64 │
╞═════╡
│ 6   │
└─────┘