auto save

my_tree.py

 import turtle
+import random
+def tree(n):
+    if r>=0:
 
 pen = turtle.Turtle()
 pen.color("sienna")
@@ -13,16 +16,21 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 def tree(n):
-    if n>=50:
+    if n>=0:
+        if n <=12:
+            color_list=["snow","lightcoral"]
+            color=random.choice(color_list)
+            pen.color(color)
+            pen.pensize()
         pen.forward(n)
         pen.right(30)
-        tree(n-50)
+        tree(n-10)
         pen.left(60)
-        tree(n-50)
+        tree(n-10)
         pen.right(30)
         pen.up()
         pen.backward(n)
         pen.down()
 tree(100)
 turtle.done()        
-turtle.done()
+