save project

diy1.py

 username="python"
 username="python"
 userpassword="541881845"
 userpassword="541881845"
-name = input("请输入用户名：")
-password = input("请输入密码：")
-if name == username and password == userpassword:
+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("登录成功！")
+        break
+    if name != username:
+        print("用户名不存在，请重新输入")
+    if password !=userpassword:
+        print("密码输入有误，请重新输入")
+print("欢迎来到贝尔编程！")
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