from __future__ import annotations

try:
    import dask.dataframe._pyarrow_compat
    from dask.base import compute
    from dask.dataframe import backends, dispatch, rolling
    from dask.dataframe.core import (
        DataFrame,
        Index,
        Series,
        _Frame,
        map_partitions,
        repartition,
        to_datetime,
        to_timedelta,
    )
    from dask.dataframe.groupby import Aggregation
    from dask.dataframe.io import (
        demo,
        from_array,
        from_dask_array,
        from_delayed,
        from_dict,
        from_map,
        from_pandas,
        read_csv,
        read_fwf,
        read_hdf,
        read_json,
        read_sql,
        read_sql_query,
        read_sql_table,
        read_table,
        to_bag,
        to_csv,
        to_hdf,
        to_json,
        to_records,
        to_sql,
    )
    from dask.dataframe.multi import concat, merge, merge_asof
    from dask.dataframe.numeric import to_numeric
    from dask.dataframe.optimize import optimize
    from dask.dataframe.reshape import get_dummies, melt, pivot_table
    from dask.dataframe.utils import assert_eq

    try:
        from dask.dataframe.io import read_parquet, to_parquet
    except ImportError:
        pass
    try:
        from dask.dataframe.io import read_orc, to_orc
    except ImportError:
        pass
    try:
        from dask.dataframe.core import isna
    except ImportError:
        pass
except ImportError as e:
    msg = (
        "Dask dataframe requirements are not installed.\n\n"
        "Please either conda or pip install as follows:\n\n"
        "  conda install dask                     # either conda install\n"
        '  python -m pip install "dask[dataframe]" --upgrade  # or python -m pip install'
    )
    raise ImportError(msg) from e