Adam A. Zajac wrote: > Hello all, > > I've been working with the tarfile module and just noticed an apparent > flaw in my own logic. I wanted to add files to the tar until it neared > a certain file size. After every addition I would use > os.path.getsize(). What I noticed today is that I could add a file to > the tar without the tar's size changing. I'm assuming that because the > TarFile object is not closed, finding its size that way isn't reliable. > > The first thing I tried was using flush(), but TarFile objects > apparently don't do that. I also can't close the object and reopen it > for appending because TarFile objects can't append if the tar is > compressed. And finally, I can't predict the compression ratio, so I > can't merely keep track of the size of the individual files without a > huge gap to my target size. > > I'm giving up on it for the night. Anyone have any thoughts?
Something to try, just from looking at the docs and the code: You can open the output file yourself and pass it to tarfile.open(). Then you could use f.tell() to get an idea how many bytes have been written. The file-like object being used by the tarfile is stored in its fileobj attribute so maybe you can flush that before the tell(). HTH, Kent _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
