return shenzhen margin data

    Arguments:
        date {str YYYY-MM-DD} -- date format

    Returns:
        pandas.DataFrame -- res for margin data

def QA_fetch_get_sz_margin(date):
    """return shenzhen margin data

    Arguments:
        date {str YYYY-MM-DD} -- date format

    Returns:
        pandas.DataFrame -- res for margin data
    """

    if date in trade_date_sse:
        return pd.read_excel(_sz_url.format(date)).assign(date=date).assign(sse='sz')