polars.LazyFrame.write_json#
- LazyFrame.write_json(file: None = None) str [source]#
- LazyFrame.write_json(file: IOBase | str | Path) None
Write the logical plan of this LazyFrame to a file or string in JSON format.
- Parameters:
- file
File path to which the result should be written. If set to
None
(default), the output is returned as a string instead.
See also
Examples
>>> lf = pl.LazyFrame( ... { ... "foo": [1, 2, 3], ... "bar": [6, 7, 8], ... } ... ) >>> lf.write_json() '{"DataFrameScan":{"df":{"columns":[{"name":"foo","datatype":"Int64","values":[1,2,3]},{"name":"bar","datatype":"Int64","values":[6,7,8]}]},"schema":{"inner":{"foo":"Int64","bar":"Int64"}},"output_schema":null,"projection":null,"selection":null}}'