save project

my_tree.py

@@ -7,15 +7,21 @@ w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 
 # 移动到起点
-turtle.left(90)
-turtle.forward(-150)
-turtle.forward(150)
-turtle.right(30)
-turtle.forward(50)
-turtle.up()
-turtle.goto(0,0)
-turtle.down()
-turtle.left(60)
-turtle.forward(50)
-turtle.hideturtle()
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
+
+def tree(n):
+    if n>=50:
+        pen.forward(n)
+        pen.right(30)
+        tree(n-50)
+        pen.left(60)
+        tree(n-50)
+        pen.right(30)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+tree(100)
 turtle.done()