auto save

my_tree.py

@@ -3,12 +3,23 @@ import random
 
 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)
+
         pen.forward(n)
-        pen.right(30)
-        tree(n-10)
-        pen.lfet(60)
-        tree(n-10)
-        pen.right(30)
+        angle = random.randint(0, 30)
+        length = random.randint(1,15) 
+        pen.right(angle)
+        tree(n-length)
+        pen.left(2*angle)
+        tree(n-length)
+        pen.right(angle)
         pen.up()
         pen.backward(n)
         pen.down()
@@ -28,11 +39,5 @@ pen.backward(150)    # 后退
 pen.down()
 
 
-pen.down()
-pen.forward(100)
-pen.right(30)
-pen.forward(50)
-pen.backward(50)
-pen.left(60)
-pen.forward(50)
+tree(60)
 turtle.done()
\ No newline at end of file