auto save

ity.py

+username = 'python'
+userpassword = '123456'
+while True:
+    a=input("请输出用户名：")
+    if a!=username:
+        print("用户名错误，请重新输入")
+        continue
+    b=input("请输入密码：")
+    if b!=userpassword:
+        print("密码错误，请重新输入")
+
+    if a == username and b == userpassword :
+        print("登陆成功")
+        break
+print("欢迎来到贝尔编程")
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