diff --git a/2-4-diy4-2.py b/2-4-diy4-2.py
new file mode 100644
index 0000000..c84b00b
--- /dev/null
+++ b/2-4-diy4-2.py
@@ -0,0 +1,19 @@
+username = "python"
+userpassword = "123456"
+i=3
+while True:
+    if i>0:
+        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
+        elif name != username:
+            print("用户名不存在,请重新输入!")
+            continue
+        else:
+            print("密码输入有误,请重新输入!")
+    else:
+        print("用户已被锁定,请到本公司解锁")
+        exit()        
+print("欢迎来到贝尔编程!")
\ No newline at end of file
diff --git a/diy2.py b/diy2.py
new file mode 100644
index 0000000..2f01415
--- /dev/null
+++ b/diy2.py
@@ -0,0 +1,12 @@
+username = "python"
+userpassword = "123456"
+while True:
+    n
+    password = input("请输入密码:")
+    if 
+        print("登录成功!")
+        break
+    if username!=name
+    
+    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