save project

diy2.py

+usename = "python"
+userpassword = "123456"
+while True:
+    name = input("账号：")
+    password = input("密码：")
+    if usename == name and userpassword == password :
+        print("登录成功")
+        break
+    if usename != name:
+        print("账号错误!请重新输入")
+    if userpassword != password:
+        print("密码错误!请重新输入")
+print("欢迎来到贝尔编程")
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