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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。
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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