code: def get_last_depth(self, symbol, _type):
          
          params = {'symbol': symbol, 'type': _type}
  
          url = u.MARKET_URL + '/market/depth'
  
          def _wrapper(_func):
              @wraps(_func)
              def handle():
                  _func(http_get_request(url, params))
  
              return handle
  
          return _wrapper
docs: 获取marketdepth
          :param symbol
          :param type: 可选值：{ percent10, step0, step1, step2, step3, step4, step5 }
          :return: