save project

diy2.py

+username = "wwwww"
+password = "123456"
+while True:
+    name=input("请输入用户名:")
+    userpassword = input("请输入密码:")
+    if name == username and password == userpassword:
+        print("登录成功!")
+        break
+    elif name != username:
+            print("用户名不存在，请从新输入")  
+    else:
+        print("密码错误，请从新输入")
+print("欢迎来到贝尔编程!")
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