auto save

diy.py

+username = "python"
+userpassword = "123456"
+
+while True:
+    name = input("请输入用户名:")
+    password = input("请输入密码")
+    if (username == name) and (userpassword == password):
+        print("登陆成功")
+        break
+    elif username != name:
+        print("用户名输入有误")
+    elif userpassword != password:
+        print("密码错误")
+        
+print("欢迎来到编程世界!!")
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