打开文件对象的大小 [英] Size of an open file object
问题描述
是否可以找到当前打开的文件对象的大小?
Is there a way to find the size of a file object that is currently open?
具体来说,我正在与tarfile模块一起创建tarfile,但是我不希望我的tarfile超过一定大小.据我所知,tarfile对象是类似文件的对象,因此我想一个通用的解决方案会起作用.
Specifically, I am working with the tarfile module to create tarfiles, but I don't want my tarfile to exceed a certain size. As far as I know, tarfile objects are file-like objects, so I imagine a generic solution would work.
推荐答案
$ ls -la chardet-1.0.1.tgz
-rwxr-xr-x 1 vinko vinko 179218 2008-10-20 17:49 chardet-1.0.1.tgz
$ python
Python 2.5.1 (r251:54863, Jul 31 2008, 22:53:39)
[GCC 4.1.2 (Ubuntu 4.1.2-0ubuntu4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> f = open('chardet-1.0.1.tgz','rb')
>>> f.seek(0,2)
>>> f.tell()
179218L
在示例中添加ChrisJY的想法
Adding ChrisJY's idea to the example
>>> import os
>>> os.fstat(f.fileno()).st_size
179218L
>>>
注意:根据注释,在调用f.tell()
之前必须f.seek(0, 2)
,否则将返回大小为0.
Note: Based on the comments, f.seek(0, 2)
is must before calling f.tell()
, without which it would return a size of 0. The reason is that f.seek(0, 2)
moves the file object's position to the end of the file.
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