save project

my_tree.py

 import turtle
-
+import random
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 pen.speed(0)
+n=random.randint(10,100)
 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(10/n)
         pen.forward(n)
-        pen.right(30)
+        a=random.randint(0,30)
+
+        pen.right(a)
         tree(n-10)
-        pen.left(60)
+        pen.left(2*a)
         tree(n-10)
-        pen.right(30)
+        pen.right(a)
         pen.penup()
         pen.backward(n)
         pen.pendown()
@@ -30,6 +41,6 @@ pen.down()
 # pen.forward(60)
 # pen.backward(60)
 # pen.right(30)
-tree(80)
+tree(n)
 # pen.backward(100) 
-# turtle.done()
+turtle.done()