save project

my_tree.py

 import turtle
 import turtle
+import random
 
 
-pen = turtle.Turtle()
-pen.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()
-pen.forward(100)
-pen.right(30)
-pen.forward(50)
-pen.penup()
-pen.backward(50)
-pen.left(60)
-pen.pendown
-pen.forward(50)
-pen.penup()
-pen.backward(50)
-pen.right(30)
-pen.backward(100)
-
+def tree(n):
+    if n>=0:
+        pen.forward(n)
+        pen.right(30)
+        tree(n-10)
+        pen.left(60)
+        tree(n-10)
+        pen.right(30)
+        pen.up()
+        pen.forward(n)
+        pen.down()
 turtle.done()
 turtle.done()