def topports(sort_by='records', limit=10, date=None, return_format=None):
    """Information about top ports for a particular date with return limit.

    :param sort_by: one of 'records', 'targets', 'sources'
    :param limit: number of records to be returned
    :param date: an optional string in 'Y-M-D' format or datetime.date() object
    """
    uri = '/'.join(['topports', sort_by, str(limit)])
    if date:
        try:
            uri = '/'.join([uri, date.strftime("%Y-%m-%d")])
        except AttributeError:
            uri = '/'.join([uri, date])
    return _get(uri, return_format)
Information about top ports for a particular date with return limit.

    :param sort_by: one of 'records', 'targets', 'sources'
    :param limit: number of records to be returned
    :param date: an optional string in 'Y-M-D' format or datetime.date() object