def appndd(item, cell):
    """
    Append an item to a double precision cell.

    http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/appndd_c.html

    :param item: The item to append.
    :type item: Union[float,Iterable[float]]
    :param cell: The cell to append to.
    :type cell: spiceypy.utils.support_types.SpiceCell
    """
    assert isinstance(cell, stypes.SpiceCell)
    if hasattr(item, "__iter__"):
        for d in item:
            libspice.appndd_c(ctypes.c_double(d), cell)
    else:
        item = ctypes.c_double(item)
        libspice.appndd_c(item, cell)
Append an item to a double precision cell.

    http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/appndd_c.html

    :param item: The item to append.
    :type item: Union[float,Iterable[float]]
    :param cell: The cell to append to.
    :type cell: spiceypy.utils.support_types.SpiceCell