[issue19222] Add 'x' mode to gzip.open()

[Roundup Robot]

Roundup Robot added the comment:

New changeset a728a7d46553 by Nadeem Vawda in branch 'default':
Issue #19222: Add support for the 'x' mode to the gzip module.
http://hg.python.org/cpython/rev/a728a7d46553

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nosy: +python-dev

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<http://bugs.python.org/issue19222>
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