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The current documentation for tarfile.TarFile.extractfile() does not
mention that the returned 'file-like object' supports close() and also
iteration. The attached patch (against svn trunk) fixes this.
(Background: I was wondering whether I could write
 def process_and_close_file(f_in):
 with closing(f_in) as f:
 # Do stuff with f.
and have it work whether f_in was a true file or the return value of
extractfile(), and thought from the documentation that I couldn't. Of
course, I could have just tried it, but I think fixing the documentation
wouldn't hurt.)