From 743c6290f028bd954d7351c66014e187287c52ed Mon Sep 17 00:00:00 2001
From: yumoqing <yumoqing@gmail.com>
Date: Sun, 31 Jan 2021 18:28:03 +0800
Subject: [PATCH] bugfix

---
 kivyblocks/date_picker.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kivyblocks/date_picker.py b/kivyblocks/date_picker.py
index 4249f6f..4a0bb5c 100644
--- a/kivyblocks/date_picker.py
+++ b/kivyblocks/date_picker.py
@@ -324,7 +324,7 @@ class MDDatePicker(FloatLayout, ThemableBehavior, RectangularElevationBehavior,
         self.cal_list = cal_list
 
     def change_month(self, operation):
-        op = 1 if operation is 'next' else -1
+        op = 1 if operation == 'next' else -1
         sl, sy = self.month, self.year
         m = 12 if sl + op == 0 else 1 if sl + op == 13 else sl + op
         y = sy - 1 if sl + op == 0 else sy + 1 if sl + op == 13 else sy