save project

my_tree.py

 import turtle
+import random
 
 pen = turtle.Turtle()
 pen.color('sienna')
@@ -6,6 +7,18 @@ pen.color('sienna')
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 
+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.penup()
+        pen.backward(n)
+        pen.down()
+
 # 移动到起点
 pen.left(90)
 pen.up()
@@ -13,18 +26,7 @@ pen.backward(150)    # 后退
 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()