save project

my_tree.py

 import turtle
 import random
+from pygame import locals
+FPS = 100    # 帧率
 pen = turtle.Turtle()
+colors = ['snow','lightcoral']
 pen.color('sienna')      # sienna黄土色
 # 画布大小
 w = turtle.Screen()
@@ -13,20 +16,27 @@ pen.down()
 
 def tree(n):
     if n>=0:
+        if n<=12:
+            color = random.choice(colors)
+            pen.pencolor(color)
+            pen.pensize(n/2)
+        else:
             pen.pensize(n/10)
+            pen.pencolor('sienna')
         pen.forward(n)
         angle = random.randint(0,30)    # 随机角度
         length = random.randint(1,15)
-        pen.right(30)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
-        pen.right(30)
+        pen.right(angle)
+        tree(n-length)
+        pen.left(2*angle)
+        tree(n-length)
+        pen.right(angle)
         pen.up()
         pen.backward(n)
         pen.down()      
-    if n
+    
 tree(100)
 
 pen.hideturtle()
 turtle.done()
+clock.tick(FPS)    # 加速
\ No newline at end of file