save project

my_tree.py

 import turtle
-
+import random
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
@@ -12,12 +12,22 @@ pen.up()
 pen.backward(150)    # 后退
 def t(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)
         pen.forward(n)
-        pen.right(30)
-        t(n-10)
-        pen.left(60)
-        t(n-10)
-        pen.right(30)
+        a=random.random()
+        pen.right(30*a)
+        l=1.5*random.random()
+        t(n-10*l)
+        pen.left(60*a)
+        t(n-10*l)
+        pen.right(30*a)
         pen.up()
         pen.backward(n)
         pen.down()