Create TarFile using string buffers

[aurora00 at gmail.com]

I have a program that generates a number of files that will be
packaged into a tarball. Can I stream the content into TarFile without
first writing them out to the file system? All add(), addfile() and
gettarinfo() seems to assume there is a file in the disk. But for me I
seems inefficient to write all the content to the disk and then have
it read back by the TarFile module.

Thank you for your help

wy