polars.DataFrame.deserialize#

classmethod DataFrame.deserialize( source: str | Path | IOBase, *, format: SerializationFormat = 'binary', ) → DataFrame[source]#

Read a serialized DataFrame from a file.

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).

format

The format with which the DataFrame was serialized. Options:

"binary": Deserialize from binary format (bytes). This is the default.
"json": Deserialize from JSON format (string).

See also

DataFrame.serialize

Notes

Serialization is not stable across Polars versions: a LazyFrame serialized in one Polars version may not be deserializable in another Polars version.

Examples

>>> import io
>>> df = pl.DataFrame({"a": [1, 2, 3], "b": [4.0, 5.0, 6.0]})
>>> bytes = df.serialize()
>>> pl.DataFrame.deserialize(io.BytesIO(bytes))
shape: (3, 2)
┌─────┬─────┐
│ a   ┆ b   │
│ --- ┆ --- │
│ i64 ┆ f64 │
╞═════╪═════╡
│ 1   ┆ 4.0 │
│ 2   ┆ 5.0 │
│ 3   ┆ 6.0 │
└─────┴─────┘