auto save

my_tree.py

 import turtle
-
-
+import random
+a=random.randint(1,2)
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
 w = turtle.Screen()
-w.bgcolor('wheat')      # wheat小麦
-
+if a==1:
+    w.bgcolor('beige')# beige米白
+else:
+    w.bgcolor('wheat')# wheat小麦
+      
+pen.hideturtle()
 # 移动到起点
 pen.left(90)
 pen.up()