save project

my_tree.py

@@ -6,15 +6,21 @@ pen.color('sienna')
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 
+def a(n):
+    if n>=50:
+        pen.forward(n)
+        pen.right(30)
+        a(n-5)
+        pen.left(60)
+        a(n-5)
+        pen.right(30)
+        pen.up()
+        pen.backward(n)
+        pen.down()
 # 移动到起点
 pen.left(90)
 pen.up()
 pen.backward(150)    # 后退
 pen.down()
-pen.forward(100)
-pen.right(30)
-pen.forward(50)
-pen.forward(-50)
-pen.left(60)
-pen.forward(50)
+a(100)
 turtle.done()