auto save

0.py

+username = "python"
+userpassword = "123456"
+while True:
+    name = input("请输入用户名:")
+    password = input("请输入密码:")
+    if name == username and password == userpassword:
+        print("登录成功!")
+        print("欢迎来到贝尔编程!")
+        break
+    else:    
+        print("用户名和密码错误!请重新输入")
+        if name != username:
+        print("用户不存在")
+        if password != userpassword:
+        print("密码错误!")
\ No newline at end of file

diy2.py

@@ -8,4 +8,8 @@ while True:
         print("欢迎来到贝尔编程!")
         print("欢迎来到贝尔编程!")
         break
         break
     else:    
     else:    
-        print("用户名和密码错误!请重新输入")
+        print("用户名和密码错误!请重新输入")
\ No newline at end of file
+        if name != username:
+        print("用户不存在")
+        if password != userpassword:
+        print("密码错误!")
\ No newline at end of file