save project

my_tree.py

 import turtle
-
+import random
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
@@ -7,7 +7,14 @@ w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 def  tree(n):
     if n>=0:
-        pen.pensize(n/10)
+        if n<=12:
+            color_list=['snow','lightcoral']
+            color=random.randint(color_list)
+            pen.color(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)