auto save

da.py

+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:")
+        i -= 1
+        if name == username and password == userpassword:
+            print("登录成功!")
+            break
+        elif name != username:
+            print("用户名输入错误！")
+        elif password != userpassword:
+            print("密码输入错误！")
+    else:
+        print("你的账号已锁定，请来我司解锁")
+        exit()
+print("欢迎来到贝尔编程!")
\ No newline at end of file