auto save

.py

+username='python'
+userpassword='123456'
+while True:
+    name=input("请输入账号")
+    password=input("请输入密码")
+    if username==name and userpassword==password:
+        break
+    if username!=name:
+        print("账号错误")
+    if password!=userpassword:
+        print("密码错误")
+print("欢迎来到贝尔编程")
\ No newline at end of file