auto save

diy2.py

+username = "python"
+userpassword = "123456"
+while True:
+    name = input("1111:")
+    password = input:")
+    if name == username and password == userpassword:
+        print("登录成功!")
+        break
+    if name !=username:
+        print('账号输入错误')
+    
+    print("用户和密码错误!请重新输入")
+print("欢迎来到贝尔编程!")
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