save project

diy2.py

@@ -3,8 +3,13 @@ userpassword = "668895"
 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!")
-        break
+    if name != username:
+        print("用户名错误！")        
+    else:    
+        if password != userpassword:
+            print("密码错误")
+        else:                    
+            print("登录成功!")
+            break
     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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