Function f

dask/dataframe/tests/test_dataframe.py:933–939

(df, partition_info=None)

def test_map_partitions_partition_info():
    def f(df, partition_info=None):
        assert partition_info is not None
        assert "number" in partition_info
        assert "division" in partition_info
        assert dsk[("x", partition_info["number"])].equals(df)
        assert dsk[("x", d.divisions.index(partition_info["division"]))].equals(df)
        return df

    df = d.map_partitions(f, meta=d)
    result = df.compute(scheduler="single-threaded")