save project

my_tree.py

@@ -12,12 +12,14 @@ def tree(n):
             pen.pencolor(a)
         else:
             pen.pencolor("sienna")
-            pen.pensize(n/10)
+            pen.pensize(n/5)
         pen.forward(n)
         angle = random.randint(0,30)#随机角度
         pen.right(angle)
         tree(n-lenth)
-        pen.left(2*angle)
+        pen.left(angle)
+        tree(n-lenth)
+        pen.left(angle)
         tree(n-lenth)
         pen.right(angle)
         pen.up()
@@ -32,7 +34,7 @@ w.bgcolor('wheat')      # wheat小麦
 pen.speed(1000000000000000000000000000000)
 pen.left(90)
 pen.up()
-pen.backward(150)    # 后退
+pen.backward(450)    # 后退
 pen.down()
-tree(100)
+tree(70)
 turtle.done()