save project

my_tree.py

@@ -5,11 +5,23 @@ pen.color('sienna')
 # 画布大小
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
-
+pen.speed(10000)
 # 移动到起点
 pen.left(90)
 pen.up()
-pen.backward(150)    # 后退
+pen.backward(302)    # 后退
 pen.down()
 
+def tree(n):
+    if n>=1:
+        pen.forward(n)
+        pen.right(30)
+        tree(n-1)
+        pen.left(60)
+        tree(n-1)
+        pen.right(30)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+tree(152)
 turtle.done()