From 2b8d4dc3c2cb744ac27a0e78860304d6d3218073 Mon Sep 17 00:00:00 2001
From: "wangwenxi.handsome" <wangwenxi.handsome@gmail.com>
Date: Fri, 16 Jul 2021 14:09:36 +0000
Subject: [PATCH] callable

---
 qlib/backtest/exchange.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/qlib/backtest/exchange.py b/qlib/backtest/exchange.py
index 7733891fe..8d02e7893 100644
--- a/qlib/backtest/exchange.py
+++ b/qlib/backtest/exchange.py
@@ -615,7 +615,7 @@ class BaseQuote:
         start_time: Union[pd.Timestamp, str],
         end_time: Union[pd.Timestamp, str],
         fields: Union[str, list] = None,
-        method: Union[str, Callable] = None,
+        method: Union[str, "Callable"] = None,
     ):
         """get the specific fields of stock data during start time and end_time,
            and apply method to the data.