python如何关闭已被gc化的文件？ [英] How does python close files that have been gc'ed?

问题描述

我一直认为如果一个文件没有被关闭就会被泄露，但我刚刚证实，如果我输入以下代码行，文件将关闭：

 >>> f = open（'somefile.txt'）
>>> del f 
  

出于纯粹的好奇心，这是如何工作的？我注意到该文件不包含 __ del __ 方法。

Objects / fileobject.c 中的 file_dealloc 函数。对于C类型，除非没有 __ del __ 中固有的一些问题，否则dealloc方法就像 __ del __ p>

I had always assumed that a file would leak if it was opened without being closed, but I just verified that if I enter the following lines of code, the file will close:

>>> f = open('somefile.txt')
>>> del f

Just out of sheer curiosity, how does this work? I notice that file doesn't include a __del__ method.

解决方案

In CPython, at least, files are closed when the file object is deallocated. See the file_dealloc function in Objects/fileobject.c in the CPython source. Dealloc methods are sort-of like __del__ for C types, except without some of the problems inherent to __del__.

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