auto save

diy1.py

 A="PYTHON"
 A="PYTHON"
 B="123456"
 B="123456"
-a=input("输入账户：")
-b=input("输入密码：")
-if A==a and B==b:
+while True:
+    a=input("输入账户：")
+    b=input("输入密码：")
+    if A==a and B==b:
         print("登陆成功")
         print("登陆成功")
-    
+        break
\ No newline at end of file
+    print("账号密码错误，请重新输入")
+print("欢迎来到贝尔编程")
\ No newline at end of file