Update stock_meta.py

添加了几个比较难懂的注释，这样新人能更容易理解

zvt/domain/meta/stock_meta.py

@@ -67,10 +67,14 @@ class EtfStock(StockMetaBase, PortfolioStockHistory):
 @register_entity(entity_type='stock_detail')
 class StockDetail(StockMetaBase, TradableEntity):
     __tablename__ = 'stock_detail'
-
+
+    # 所属行业
     industries = Column(String)
+    # 行业指数
     industry_indices = Column(String)
+    # 所属板块
     concept_indices = Column(String)
+    # 所属区域
     area_indices = Column(String)
 
     # 成立日期
@@ -95,4 +99,4 @@ class StockDetail(StockMetaBase, TradableEntity):
                 schema_base=StockMetaBase)
 
 # the __all__ is generated
-__all__ = ['Stock', 'Block', 'Index', 'Etf', 'BlockStock', 'IndexStock', 'EtfStock', 'StockDetail']
+__all__ = ['Stock', 'Block', 'Index', 'Etf', 'BlockStock', 'IndexStock', 'EtfStock', 'StockDetail']