auto save

my_tree.py

 import turtle
 
 pen = turtle.Turtle()
-pen.color('sienna')
+pen.color('black')
 # 画布大小
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 
 # 移动到起点
 pen.left(90)
-pen.up()
-pen.backward(150)    # 后退
 pen.down()
+pen.forward(100)
+#pen.backward(150)    # 后退
+#pen.down()
 
 turtle.done()