auto save

my_tree.py

 import turtle
 import turtle
-
+import random
 pen = turtle.Turtle()
 pen = turtle.Turtle()
 pen.color('sienna')
 pen.color('sienna')
 # 画布大小
 # 画布大小
@@ -12,15 +12,19 @@ pen.up()
 pen.backward(150)    # 后退
 pen.backward(150)    # 后退
 pen.down()
 pen.down()
 def tree(n):
 def tree(n):
-    if n>=50:
+    if n>=0:
+        pen.speed(500)
+        pen.pensize(n/10)
         pen.forward(n)
         pen.forward(n)
-        pen.right(30)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
-        pen.right(30)
+        angel=random.randint(0,30)
+        length=random.randint(0,15)
+        pen.right(angel)
+        tree(n-length)
+        pen.left(2*angel)
+        tree(n-length)
+        pen.right(angel)
         pen.up()
         pen.up()
         pen.backward(n)
         pen.backward(n)
         pen.down()
         pen.down()
-tree(100)
+tree(60)
 turtle.done()
 turtle.done()