save project

diy.py

+username = "python"
+userpssword = "123456"
+while True:
+     name=input("请输入用户名:")
+     password=input("请输入密码：")
+     if name=username and password=userpssword:
+         input("登录成功！")
+         break
+    if name != username:
+        print("用户名不存在！")
+        continue
+    if password != userpssword:
+        print("密码输错误！")
+print("欢迎来到贝尔编程！")
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