code: def QA_fetch_get_usstock_list(ip=None, port=None):
      
  
      global extension_market_list
      extension_market_list = QA_fetch_get_extensionmarket_list(
      ) if extension_market_list is None else extension_market_list
  
      return extension_market_list.query('market==74 or market==40 or market==41')
docs: [summary]
  
      Keyword Arguments:
          ip {[type]} -- [description] (default: {None})
          port {[type]} -- [description] (default: {None})
  
      ## 美股 USA STOCK
          74        13      美国股票         US
          40        11     中国概念股         CH
          41        11    美股知名公司         MG