If I understand correctly, for Ubuntu, it will be 3.4.3 directly because
it's a Micro Release Exception. Usually, they don't change version of a
package in a release, only backports like Debian.

More details : http://askubuntu.com/a/224916

To my knowledge, You don't have MRE for Debian, Debian Jessie will be
released very soon with 3.4.2 version :-\

Ludovic Gasc (GMLudo)
On 3 Feb 2015 13:59, "Victor Stinner" <[email protected]> wrote:

> Hi,
>
> The development of asyncio and trollius helped to identify and fix
> different bugs in CPython. You may be interested to know them to maybe
> workaround them if needed. I worked around the gen.send & sys.exc_info
> issues in asynco and trollius.
>
> The most recent issue is the sys.exc_info() issue when
> yield/yield-from is used in an except block of a generator.
>
>
> * 3.3.0 <= python <= 3.4.0: `gen.send(tuple) unpacks the tuple instead of
>   passing 1 argument (the tuple) when gen is an object with a send()
> method,
>   not a classic generator (#21209) <http://bugs.python.org/21209>`_.
>   Regression introduced in Python 3.4.0, fixed in Python 3.4.1.
>   trollius.CoroWrapper.send() works around the issue, the bug is checked at
>   runtime once, when the module is imported.
>
> In asyncio, the bug only impacts asyncio in debug mode, since
> CoroWrapper is only used in debug mode.
>
>
> * 2.5.0 <= python <= 3.4.2: `sys.exc_info() bug when yield/yield-from is
> used
>   in an except block in a generator (#23353>)
>   <http://bugs.python.org/issue23353>`_.  The fix will be part of Python
> 3.4.3.
>   _UnixSelectorEventLoop._make_subprocess_transport() and
>   ProactorEventLoop._make_subprocess_transport() work around the bug.
>
> On Python 3, this issue creates surprising memory leak since the last
> exception may be kept too long, while an exception has a reference to
> a traceback object which indirectly has references to many local
> variables.
>
> I recompiled Python 2.2, 2.3, 2.4 and 2.5 to check when the bug was
> introduced. yield was introduced in Python 2.2 (it required "from
> __future__ import generators"), but the generator type was only
> introduced in Python 2.5 (gen.send, gen.throw).
>
>
> * python == 3.4.0: `Segfault in gc with cyclic trash (#21435)
>   <http://bugs.python.org/issue21435>`_.
>   Regression introduced in Python 3.4.0, fixed in Python 3.4.1.
>   Status in Ubuntu the February, 3th 2015: only Ubuntu Trusty (14.04 LTS)
> is
>   impacted (`bug #1367907:  Segfault in gc with cyclic trash
>   <https://bugs.launchpad.net/ubuntu/+source/python3.4/+bug/1367907>`_,
> see
>   also `update Python3 for trusty #1348954
>   <https://bugs.launchpad.net/ubuntu/+source/python3.4/+bug/1348954>`_)
>
> This bug is annoying on Ubuntu Trusty. It will be fixed directly in
> Ubuntu, probably with an upgrade of the python3.4 package to 3.4.3. I
> didn't understand if they plan to release before a new 3.4.0 package
> with the patch.
>
> There is no known workaround.
>
> Victor
>

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