save project

my_tree.py

 import turtle
 import turtle
-
 pen = turtle.Turtle()
 pen = turtle.Turtle()
 pen.color('sienna')
 pen.color('sienna')
+pen.speed()
 w = turtle.Screen()
 w = turtle.Screen()
-w.bgcolor('wheat')      # wheat小麦
-
-# 移动到起点
+w.bgcolor('wheat') 
 pen.left(90)
 pen.left(90)
-pen.up()
-pen.backward(50)    # 后退
-pen.down()
-pen.color("red")
-pen.forward(50)
-pen.left(45)
-pen.forward(25)
-pen.up()
-pen.backward(25)    # 后退
-pen.down()
-pen.left(270)
-pen.forward(25)
-
-pen.forward(25)
-pen.left(45)
-pen.forward(25)
-pen.up()
-pen.backward(25)    # 后退
-pen.down()
-pen.left(270)
-pen.forward(25)
+def tree(n):  
+    if n>=50:# wheat小麦
 
 
-pen.forward(25)
-pen.left(15)
-pen.forward(25)
-pen.up()
-pen.backward(25)    # 后退
-pen.down()
-pen.left(270)
-pen.forward(25)
+        pen.color("red")
+        pen.forward(n)
+        pen.right(30)
+        tree(n-10)
+        pen.left(60)
+        tree(n-10)
+        pen.up()
+        pen.right(30)
+        pen.backward(n)
+        pen.down()
+tree(100)