auto save

my_tree.py

 import turtle
 
+
 pen = turtle.Turtle()
 pen.color('sienna')
 # 画布大小
@@ -13,6 +14,17 @@ pen.backward(150)    # 后退
 pen.down()
 
 # 分形树
-
-tree(100)
+def tree(n):  # 画树枝
+    if n>=0:
+        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()
+        
+tree(60)
 turtle.done()