auto save

my_tree.py

 import turtle
-
+import random
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
@@ -14,16 +14,18 @@ pen.backward(150)    # 后退
 pen.down()
 
 def tree(n):
-    if n>=50:
+    if n>=0:
+        a=random.randint(0,30)
+        b=random.randint(0,15)
         pen.forward(n)
-        pen.right(30)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
-        pen.right(30)
+        pen.right(a)
+        tree(n-b)
+        pen.left(2*a)
+        tree(n-b)
+        pen.right(a)
         pen.penup()
         pen.backward(n)
         pen.pendown()
-tree(100)
-turtle.done()    
+tree(60)
 
+turtle.done()