[issue10905] zipfile: fix arcname with leading '///' or '..'

[Zhigang Wang]

Zhigang Wang <w1z2g3 at gmail.com> added the comment:

Yes, in zipfile, we just overwrite it. Actually, ZipFile.extract() overwrite existing files already. If we want it more powerful, we can add a 'overwrite' parameter. But turning zipfile a full featured zip/unzip tool needs much more extra work...

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10905>
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