save project

diy2.py

+username="beier"
+userpassword="142857"
+while True:
+    name=input("账号：")
+    password=input("密码：")
+    if name == username and password == userpassword:
+        print("登陆成功！！！！！！")
+        break
+    if name!=username:
+        print("用户名不存在！请再试一次！！！！！")
+    if password!=userpassword:
+        print("密码不正确！请再试一次！！！！！")
+print("欢迎来到贝尔编程！！！！！！")
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