Lars Gustäbel <l...@gustaebel.de> added the comment:

I found an issue that needs to be addressed: if there is an error while the 
TarFile object is opened for writing, we cannot simply call TarFile.close() in 
the __exit__() method. close() would try to finalize the archive, i.e. write 
two zero end-of-archive blocks and a number of padding blocks.

I changed __exit__() to call close() only if everything went fine. If there was 
an exception only the most basic cleanup is done.

I added more tests and adapted the docs.

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Added file: http://bugs.python.org/file16401/issue7232.9.diff

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