<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def raw_abundance(biomf, sampleIDs=None, sample_abd=True):
 """ Calculate the total number of sequences in each OTU or SampleID. :type biomf: A BIOM file. :param biomf: OTU table format. :type sampleIDs: List :param sampleIDs: A list of column id's from BIOM format OTU table. By default, the list has been set to None. :type sample_abd: Boolean :param sample_abd: A boolean operator to provide output for OTUID's or SampleID's. By default, the output will be provided for SampleID's. :rtype: dict :return: Returns a dictionary keyed on either OTUID's or SampleIDs and their respective abundance as values. """

    results = defaultdict(int)
    if sampleIDs is None:
        sampleIDs = biomf.ids()
    else:
        try:
            for sid in sampleIDs:
                assert sid in biomf.ids()
        except AssertionError:
            raise ValueError(
                "\nError while calculating raw total abundances: The sampleIDs provided "
                "do not match the sampleIDs in biom file. Please double check the "
                "sampleIDs provided.\n")
    otuIDs = biomf.ids(axis="observation")

    for sampleID in sampleIDs:
        for otuID in otuIDs:
            abd = biomf.get_value_by_ids(otuID, sampleID)
            if sample_abd:
                results[sampleID] += abd
            else:
                results[otuID] += abd
    return results