save project

my_tree.py

 import turtle
 import turtle
 import random
 import random
+import 
+l = ["snow","lightcoral"]
 def tree(n):
 def tree(n):
     if n >=0:
     if n >=0:
-        pen.pensize(n/10)
+        lenth = random.randint(1,15)
+        if n <= 10:
+            pen.pensize(n)
+            a = random.choice(l)
+            pen.pencolor(a)
+        else:
+            pen.pencolor("sienna")
+            pen.pensize(n/10)
         pen.forward(n)
         pen.forward(n)
         angle = random.randint(0,30)#随机角度
         angle = random.randint(0,30)#随机角度
-        lenth = random.randint(1,15)
         pen.right(angle)
         pen.right(angle)
         tree(n-lenth)
         tree(n-lenth)
         pen.left(2*angle)
         pen.left(2*angle)
@@ -25,5 +33,5 @@ pen.left(90)
 pen.up()
 pen.up()
 pen.backward(150)    # 后退
 pen.backward(150)    # 后退
 pen.down()
 pen.down()
-tree(50)
+tree(100)
 turtle.done()
 turtle.done()