auto save

diy2.py

 message = "诺依，周末一起去看动漫展吧！"
-for i in message:
-    print(i)
+length = len(message)
 # 请对message进行遍历，取出所有元素
-
+i = 0
+while i < length:
+    x = message[i] 
+    print(x)
+    i += 1