save project

my_tree.py

 import turtle
-
+import random
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
@@ -13,14 +13,24 @@ pen.backward(150)    # 后退
 pen.down()
 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)
+        a=random.randint(0,30)
+        b=random.randint(1,15)
         pen.forward(n)
-        pen.right(30)
+        pen.right(a)
         tree(n-10)
         
         
-        pen.left(60)
+        pen.left(a*2)
         tree(n-10)
-        pen.right(30)
+        pen.right(a)
         pen.up()
         pen.backward(n)