save project

diy1.py

 username = "python"    
 username = "python"    
-userpassword = "123456"    
-name=input("请输入您的帐号：")
-password=input("请输入您的密码:")
-if name == username and password == userpassword:
-    print("登录成功！")
-# 如果用户输入的账号、密码正确，提示登陆成功
+userpassword = "123456" 
+while  True: 
+    name=input("请输入您的帐号：")
+    password=input("请输入您的密码:")
+    if name == username and password == userpassword:
+        print("登录成功！")
\ No newline at end of file
+        break
+    if name !=username:
+        print("不存在")
+    if password != userpassword:
+        print("有误")
+    print("错误")
+print("欢迎")
\ No newline at end of file