On 13/06/2011 12:47, Vinay Sajip wrote:
Back in March this year, Carl Meyer did some work to see if it was feasible
to bring virtualenv functionality into Python [1] (code at [2]).
Carl's changes were to Python code only, which was almost but not quite enough.
I built on his changes with updates to C code in getpath.c/getpathp.c, and my
code is at [3]. I've kept it synchronised with the core cpython repo, including
the recently committed packaging modules.
While there are issues to work through such as dealing with source builds (and
no doubt plenty of others), it now seems possible to create virtual
environments and install stuff into them using just the stdlib (modulo
currently needing Distribute for the packages which don't yet support
setup.cfg-based packaging, but it's all done automatically for a user). So you
can do e.g.
$ python3.3 -m virtualize /tmp/venv
$ source /tmp/venv/bin/activate.sh
$ pysetup3 install Mako
and so on. A log of early experiments, which seems reasonably promising, is at
[4].
Do people agree that it may be fitting, proper and timely to bring
virtualisation into Python, and are there any fundamental flaws anyone can see
with the approach used?
It would certainly need a PEP.
There are two options:
Bring the full functionality into the standard library so that Python
supports virtual environments out of the box. As is the case with adding
anything to the standard library it will then be impossible to add
features to the virtualization support in Python 3.3 once 3.3 is
released - new features will go into 3.4.
Add only the minimal changes required to support a third-party virtual
environment tool.
Virtual environments are phenomenally useful, so I would support having
the full tool in the standard library, but it does raise maintenance and
development issues.
Don't forget windows support! ;-)
All the best,
Michael Foord
If people want to experiment with this code without cloning and building, I
created a Debian package using checkinstall, which can be installed using
sudo dpkg -i pythonv_3.3-1_i386.deb
and removed using
sudo dpkg -r pythonv
I can make this Debian package available for download, if anyone wants it.
Regards,
Vinay Sajip
[1] http://mail.python.org/pipermail/distutils-sig/2011-March/017519.html
[2] https://bitbucket.org/carljm/cpythonv
[3] https://bitbucket.org/vinay.sajip/pythonv
[4] https://gist.github.com/1022601
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