save project

my_tree.py

@@ -6,7 +6,16 @@ pen.color('sienna')
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 def tree(n):
+    pen.speed(20)
     if n>=0:
+        if n <=15:
+            color_list=['snow','lightcoral']
+            color=random.choice(color_list)
+            pen.pencolor(color)
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
         pen.forward(n)
         angle = random.randint(0,30)
         length = random.randint(1,15)