save project

diy1.py

-username = "python"
-username =    "123456"
-name = input("请输入用户名")
-password = input("请输入密码")
-if name == username and password == userpassword:
+  username = "python"
+  username =    "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("登录成功")
         print("登录成功")
+        break
+    print("用户密码错误！请重新输入")
+print("欢迎")
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