auto save

my_tree.py

 import turtle
-
+import random as r
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
 w = turtle.Screen()
-w.bgcolor('wheat')      # wheat小麦
-
-# 移动到起点
+w.bgcolor('wheat')
+turtle.setup(800,600,400,450)
 pen.left(90)
 pen.up()
-pen.backward(150)    # 后退
+pen.backward(300)
 pen.down()
-pen.forward(100)
-pen.right(30)
-pen.forward(50)
-pen.backward(50)
-pen.left(60)
-pen.forward(50)
+a=0
+def tree(n):
+        if n>=50:
+            angle=r.randint(15,45)
+            pen.speed(10)
+                # 后退
+            a=r.randint(n-10,n+10)
+            pen.forward(a)
+            pen.right(angle)
+            tree(n-10)
+            pen.left(angle*2)
+            tree(n-10)
+            pen.right(angle)
+            pen.up()
+            pen.backward(a)
+            pen.down()
+      # wheat小麦
+
+# 移动到起点
 
+tree(100)
 turtle.done()