def _wanmen_get_title_by_json_topic_part(json_content, tIndex, pIndex):
    """JSON, int, int, int->str
    
    Get a proper title with courseid+topicID+partID."""
    return '_'.join([json_content[0]['name'], json_content[0]['Topics'][
        tIndex]['name'], json_content[0]['Topics'][tIndex]['Parts'][pIndex]
        ['name']])
