[issue17681] Work with an extra field of gzip and zip files

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


Removed file: http://bugs.python.org/file30411/gzip_extra.diff

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17681>
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