auto save

diy2.py

+username = "黎君玉"
+userpassword = "1592"
+while True:
+    n = input("请输入用户名:")
+    p = input("请输入密码:")
+    if n == username:
+         
+        p == userpassword
+        print("登录成功!")
+        break 
+    if n != username and p!= userpassword:    
+        print("用户名和密码错误!请重新输入")
+print("欢迎来到贝尔编程!")
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