save project

diy2.py

+username = "lyy"
+userpassword = "000"
+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
+    if name != username:
+        print("用户不存在，请重输")
+        continue
+    if password != userpassword:
+        print("密码错误，请重输")
+print("欢迎")