auto save

diy2.py

+username='py'
+userpassword='428319'
+while True:
+    name=input("请输入账户名:")
+    password=input("请输入密码:")
+    if username==name and userpassword==password:
+        print("登录成功")
+        break
+    if username!=name:
+        print("重新输入名字")
+    if userpassword!=password:
+        print("重新输入密码")
+print("欢迎来到贝尔编程")
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