auto save

my_tree.py

 import turtle
 
-pen = turtle.Turtle()
-pen.color('sienna')
+p = turtle.Turtle()
+def tree(n):
+    if n >= 30:
+        p.forward(n)
+        p.right(30)
+        p.forward(50)
+        p.penup()
+        p.backward(50)
+        p.pendown()
+        p.left(60)
+        p.forward(50)
+        p.penup()
+        p.backward(50)
+        p.pendown()
+        p.left(150)
+        p.forward(100)
+
+p.color('sienna')
 # 画布大小
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 
 # 移动到起点
-pen.left(90)
-pen.up()
-pen.backward(150)    # 后退
-pen.down()
+p.left(90)
+p.up()
+p.backward(150)    # 后退
+p.down()
+p.forward(100)
+p.right(30)
+p.forward(50)
+p.penup()
+p.backward(50)
+p.pendown()
+p.left(60)
+p.forward(50)
+p.penup()
+p.backward(50)
+p.pendown()
+p.left(150)
+p.forward(100)
 
 turtle.done()