Python 刷新和已经关闭的文件

Question

当某些函数已经完成 f.close() 时，如何添加检查以避免使用 f.flush() 刷新文件 f？

我似乎不知道该怎么做:/

Answer 1

您可以使用 try ...except我猜是为了这个目的

Any operation which requires that the file be open will raise a ValueError after the file has been closed

或者使用 fileobj.closed 属性，如果它是 True 则不执行刷新

file.closed bool indicating the current state of the file object. This is a read-only attribute; the close() method changes the value. It may not be available on all file-like objects.