save project

diy2.py

 username="yl"
 userpassword="yyds"
-name=input("请输入用户名")
-password=input("请输入密码")
-if name==username and password == userpassword:
+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")
+        break
+    print("用户名和密码错误")
+print("欢迎来到YL宇宙")