auto save

diy1.py

+username = 'python'
+userpassword = '123456'
+while True:
+    a = input('请输入账号')
+    b = input('请输入密码')
+
+    if a==username and b==userpassword:
+        print('验证通过')
+        break
+    print('输入错误，请重新输入！')
+print('欢迎来到贝尔编程！')
+