code: def get_symbols(self, site='Pro'):
          
          assert site in ['Pro', 'HADAX']
          params = {}
          path = f'/v1{"/" if site == "Pro" else "/hadax/"}common/symbols'
  
          def _wrapper(_func):
              @wraps(_func)
              def handle():
                  _func(api_key_get(params, path))
  
              return handle
  
          return _wrapper
docs: 获取支持的交易对
          :param site:
          :return: