save project

my_tree.py

@@ -4,20 +4,21 @@ pen = turtle.Turtle()
 pen.color('sienna')
 pen.color('sienna')
 # 画布大小
 # 画布大小
 w = turtle.Screen()
 w = turtle.Screen()
-w.bgcolor('wheat')      # wheat小麦
+w.bgcolor('wheat')
+pen.down()      # wheat小麦
 
 
 # 移动到起点
 # 移动到起点
-pen.left(90)
-pen.up()
-pen.forward(100)
-pen.right(30)
-pen.backward(150)    # 后退
-pen.down()
-pen.forward(50)
-pen.forward(-50)
-pen.left(60)
-pen.forward(50)
-pen.forward(-50)
-pen.seth(90)
-pen.forward(-100)
+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(50)    # 后退
+        pen.down()
+
+tree(100)        
 turtle.done()
 turtle.done()