save project

diy3.py

+username = "python"
+userpassword = "123456"
+while True:
+    username1=input("输入用户名")
+    password1 = input("请输入密码:")
+    if username1==username and password1==userpassword: 
+       print("登陆成功")
+       break 
+    elif username1!=username:
+        print("用户名输入错误，请重新输入")
+    else:
+        print("密码输入错误，请重新输入")      
+print("欢迎来到贝尔编程")    
+