save project

diy1.py

 username = "DCH"    # 保存在服务器数据库中的用户账号（正确的账号）
 userpassword="1CS"
 # 请用input()实现用户输入账号、密码的功能
-
-name=input("username?")
-password=input("userpassword?")
+while True:
+    
+    name=input("username?")
+    password=input("userpassword?")
 # 如果用户输入的账号、密码正确，提示登陆成功
-if name==username and password==userpassword:
-    print("成功")
-    break
-    print("Username and userpassword middle have own error")
-print("Username and userpassword are correct.Wlcome!")    
+    if name==username and password==userpassword:
+        print("成功")
+        break
+    if name!=username:
+        print("Username have own error")
+    if password!=userpassword:
+        print("Userpassword have own error")
+print("Username and userpassword are correct.Wlcome!")
+