How to use the pyteomics.xml._local_name function in pyteomics

tag_name: str
        The name of the XML tag to parse until
    quit_name: str
        The name to stop parsing at.

    Yields
    ------
    lxml.etree.Element
    '''
    g = etree.iterparse(source, ('start', 'end'))
    for event, tag in g:
        if event == 'start':
            if xml._local_name(tag) == quit_name:
                break
            else:
                if xml._local_name(tag) == target_name:
                    yield tag
                else:
                    tag.clear()

Parameters
    ----------
    source: file-like
        A file-like object over an XML document
    tag_name: str
        The name of the XML tag to parse until

    Returns
    -------
    dict
    '''
    g = etree.iterparse(source, ('start', 'end'))
    for event, tag in g:
        if event == 'start':
            if xml._local_name(tag) == tag_name:
                return tag.attrib
            else:
                continue
        else:
            tag.clear()
    return None