<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def read_ligolw_dict(source, names=None, coalesce=False, **kwargs):
 """Read segments for the given flag from the LIGO_LW XML file. Parameters source : `file`, `str`, :class:`~ligo.lw.ligolw.Document`, `list` one (or more) open files or file paths, or LIGO_LW `Document` objects names : `list`, `None`, optional list of names to read or `None` to read all into a single `DataQualityFlag`. coalesce : `bool`, optional if `True`, coalesce all parsed `DataQualityFlag` objects before returning, default: `False` **kwargs other keywords are passed to :meth:`DataQualityDict.from_ligolw_tables` Returns ------- flagdict : `DataQualityDict` a new `DataQualityDict` of `DataQualityFlag` entries with ``active`` and ``known`` segments seeded from the XML tables in the given file ``fp``. """

    xmldoc = read_ligolw(source, contenthandler=segment_content_handler())

    # parse tables
    with patch_ligotimegps(type(xmldoc.childNodes[0]).__module__):
        out = DataQualityDict.from_ligolw_tables(
            *xmldoc.childNodes,
            names=names,
            **kwargs
        )

    # coalesce
    if coalesce:
        for flag in out:
            out[flag].coalesce()

    return out