auto save

my_tree.py

 import turtle
-
+import random
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
@@ -9,7 +9,21 @@ w.bgcolor('wheat')      # wheat小麦
 # 移动到起点
 pen.left(90)
 pen.up()
-pen.backward(150)    # 后退
+pen.backward(150)  
+pen.speed(100)  # 后退
 pen.down()
-
+def tree(n):
+    if n>=0:
+        jojo=random.random()
+        length=1.5*random.random()
+        pen.forward(n)
+        pen.right(jojo*30)
+        tree(n-length*10)
+        pen.left(jojo*60)
+        tree(n-length*10)
+        pen.right(jojo*30)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+tree(60)
 turtle.done()