save project

diy2.py

+username ="python"
+usernpassword ="123456"
+while True:
+    name =input("请输入用户名:")
+    password = input("请输入密码:")
+    if name ==username and password ==usernpassword:
+        print("登录成功")
+        break
+    if name != username:
+        print("用户名不存在,请重新输入！")
+     if password！ = usernam    
+    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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