save project

my_tree.py

 from turtle import *
-from random import *
+from random import random as rdm,randint as rdt,choice as chc
 
 def tree(n):
     if n >= 0:
+        if n <= 12:
+            colorlist = ["snow","lightcoral"]
+            color = chc(colorlist)
+            pen.color(color)
+            pen.pensize(n / 3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n /10)
         pen.fd(n)
-        pen.rt(30)
-        tree(n - 10)
-        pen.lt(60)
-        tree(n - 10)
-        pen.rt(30)
+        angle = rdt(0,30)
+        pen.rt(angle)
+        leng = 15 * rdm()
+        tree(n - leng)
+        pen.lt(angle * 2)
+        tree(n - leng)
+        pen.rt(angle)
         pen.pu()
         pen.bk(n)
         pen.pd()
 
 pen = Pen()
-pen.color('sienna')
-#pen.ht()
+pen.ht()
 # 画布大小
 w = Screen()
 w.bgcolor('wheat')      # wheat小麦