auto save

my_tree.py

 import turtle
-import random
+im
 def tree(n):
-    if n>=0:
+    if n>=50:
         pen.forward(n)
-        angle = random.randint(0,30)
-        length = random.randint(1,15)
-        pen.right(angle)
-        tree(n-length)
-        pen.left(2*angle)
-        tree(n-length)
-        pen.right(angle)
+        pen.right(30)
+        tree(n-10)
+        pen.left(60)
+        tree(n-10)
+        pen.right(30)
         pen.up()
         pen.backward(n)
         pen.down()
@@ -20,5 +18,10 @@ 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.color("brown")
+tree(100)
 turtle.done()