Is there a way to find the size of a file object that is currently open?
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.
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Answer
$ 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, os.SEEK_END) >>> f.tell() 179218L
Adding ChrisJY’s idea to the example
>>> import os >>> os.fstat(f.fileno()).st_size 179218L >>>
Note: Based on the comments, f.seek(0, os.SEEK_END)
is must before calling f.tell()
, without which it would return a size of 0. The reason is that f.seek(0, os.SEEK_END)
moves the file object’s position to the end of the file.