save project

2.py

+username='python'
+userpassword='123456'
+while True:
+    name=input("请输入用户名：")
+    password=input("请输入密码：")
+    if name == username and password == userpassword:
+       print("登陆成功！")
+       print("欢迎来到贝儿编程")
+        break 
+    elif name != username:
+        print("用户名不存在，请重新输入")
+    else name == username and password != userpassword:
+        print("密码错误，请重新输入")
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