auto save

1.py

 import turtle
 import random
+
 def tree(n):
     if n>=0:
+        
+        if n<=12:
+            color_list=["snow","lightcoral"]
+            color=random.choice(color_list)
+            pen.color(color) 
+            pen.pensize(n/3)
+        else:
+            pen.color("sienna")
+            pen.pensize(n/10)
+        
+        
         pen.fd(n)
         angle=random.randint(0,30)
-        length=random.randint(1,15)
         pen.rt(angle)
+        length=random.randint(1,15)
         tree(n-length)
         pen.lt(2*angle)
         tree(n-length)
@@ -14,11 +26,13 @@ def tree(n):
         pen.bk(n)
         pen.down()
 pen = turtle.Turtle()
+pen.lt(90)
 pen.color('sienna')
+pen.speed(0)
 # 画布大小
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 # 移动到起点
-pen.lt(90)
+
 tree(60)
 turtle.done()
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