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7. Os.path.isfile ()--Determines whether the specified object is a file. Yes returns True, otherwise False? Disadvantages: Threads are not safe, and asynchrony is easy to occur in multithreading, such as frequent read and write operations on database objects.在新一季中，Quentin以及朋友将开启一场魔法世界的革命。斯黛拉·麦薇（Stella Maeve）、奥利维亚·泰勒·达德利（Olivia Taylor Dudley）、哈尔·阿普尔曼（Hale Appleman）、阿俊·古普塔（Arjun Gupta）、莎莫·比施尔（Summer Bishil）、里克·沃尔斯（Rick Worthy）、崔佛·艾因霍恩（Trevor Einhorn）和布莱特妮·柯伦（Brittany Curran）等都有望继续回归。Compared with online institutions, first of all, customers have stronger trust in physical institutions; Secondly, offline organizations have a strong scene, making it relatively easier to manage teachers and supervise students' learning. In addition, the teacher-student interaction and student-student interaction in offline institutions are more direct and social. However, due to its strong regionality, its customers are more direct and accurate.劳尔（河本启佑 配音）自小就立志成为一名勇者，并且为了实现理想而付出了大量的努力和汗水，尽管周围的人都将劳尔看作是胡言乱语的怪人，但这并没有阻止劳尔追逐梦想的脚步。然而，就在他即将取得勇者测验合格证的前夕，竟然出来了魔王被打倒的消息，勇者制度亦因此被废除，这也就意味着，勇者劳尔，失业了。讲金钱