save project

my_tree.py

 import turtle
 import turtle
+import random
 
 
 pen = turtle.Turtle()
 pen = turtle.Turtle()
 pen.color('sienna')
 pen.color('sienna')
-                        # 画布大小
+
 w = turtle.Screen()
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 w.bgcolor('wheat')      # wheat小麦
 
 
-                        # 移动到起点
+def tree(n):
+    if n>=50:
+        pen.forward(n)
+        pen.right(30)
+        tree(n-10)
+        pen.left(60)
+        tree(n-10)
+        pen.right(30)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+
 pen.left(90)
 pen.left(90)
 pen.up()
 pen.up()
 pen.backward(150)       # 后退
 pen.backward(150)       # 后退
 pen.down()
 pen.down()
 
 
-
-pen.forward(100)
-pen.right(30)
-pen.forward(50)
-pen.penup()
-pen.forward(-50)
-pen.left(60)
-pen.down()
-pen.forward(50)
-pen.penup()
-pen.forward(-50)
-pen.right(30)
-pen.forward(-100)
-
+tree(100)
 turtle.done()
 turtle.done()