product_id字段中文名：品种代码

gamcing · gamcing · commit 0a0c2c4d42b8 · 2020-02-18T12:28:38.000+08:00
diff --git a/tqsdk/objs.py b/tqsdk/objs.py
@@ -149,7 +149,7 @@ def __init__(self, api):
         self.delivery_year = 0
         #: 期权方向
         self.option_class = ""
-        #: 合约id
+        #: 品种代码
         self.product_id = ""
 
     def _instance_entity(self, path):
