diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..5d3f1ac
--- /dev/null
+++ b/diy4.py
@@ -0,0 +1,9 @@
+username = "python"
+userpassword = "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("用户名和密码错误!请重新输入")
+print("欢迎来到贝尔编程!")
\ No newline at end of file