save project

my_tree.py

 import turtle
 import turtle
+import random
 
 
 pen = turtle.Turtle()
 pen = turtle.Turtle()
 pen.color('sienna')
 pen.color('sienna')
@@ -14,15 +15,21 @@ pen.down()
 
 
 
 
 def tree(n):
 def tree(n):
-    if n >=50:
+    if n>=0:
         pen.forward(n)
         pen.forward(n)
         pen.right(30)
         pen.right(30)
-        tree(n-50)
+        tree(n-10)
         pen.left(60)
         pen.left(60)
-        tree(n-50)
+        tree(n-10)
         pen.right(30)
         pen.right(30)
         pen.up()
         pen.up()
         pen.backward(n)
         pen.backward(n)
         pen.down()
         pen.down()
-tree(100)
+
+pen = turtle.Turtle()
+pen.color('sienna')
+# 画布大小
+w = turtle.Screen()
+w.bgcolor('wheat')     
+tree(60)
 turtle.done()           
 turtle.done()