auto save

diy2.py

+username = "python"
+userpassword = "123456"
+
+while True:
+    nume=input("请输入用户名")
+    password=input("请输入密码")
+    if nume == username and password == userpassword:
+        print("登录成功")
+        break
+    if nume != username:
+        input("用户名错误")
+    if password != userpassword:
+        input("密码错误")
+print("欢迎来到贝尔编程！")
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