auto save

p1.py

 username="phyton"
 userpassword="123456"
-name=input("请输入账号")
-password=input("请输入密码")
-if username==name and userpassword==password:
-    print("登录成功")
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+while True:
+    name=input("请输入账号")
+    password=input("请输入密码")
+    if username==name and userpassword==password:
+        print("登录成功")
+        break
+    if name!=username:
+        print("用户名输入错误，请重新输入")
+    if password!=userpassword:
+        print("用户密码输入错误，请重新输入")
+    if name!=username and password!=userpassword:
+        print("用户账号和密码输入错误，请重新输入")
+print("欢迎来到贝尔编程")
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