auto save

my_tree.py

 import turtle
 
+
+def tree(n):
+    if :
+        pen.forward(n)
+        pen.penup()
+        pen.backward(n)
+        pen.pendown()
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
@@ -12,4 +19,7 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 
+tree(100)
+
+pen.hideturtle()
 turtle.done()