[IPython-User] virtualenv and sys.path order

[Thomas Wiecki]

Hi,

I set up a virtualenv so that an extra-search-dir overwrites a
globally installed package.

This works (from inside the venv) with python (i.e. sys.path has the
extra-search-dir before the system wide package dir in
/usr/local/lib).

However, in ipython, the sys.path includes the system wide packages
before the extra-search-dir. How does this happen? Can I set it up so
that the extra-search-dir is included in the sys.path before
everything else?

Thanks,
Thomas
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[Thomas Kluyver-2]

On 13 April 2012 15:41, Thomas Wiecki <[hidden email]> wrote:
> However, in ipython, the sys.path includes the system wide packages
> before the extra-search-dir. How does this happen?

Have you installed IPython inside the virtualenv? If not, please do
and see if the problem continues.

If you have, how is an extra-search-dir specified? I'm not all that
familiar with virtualenv features.

Thomas
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[Thomas Wiecki]

On Fri, Apr 13, 2012 at 11:02 AM, Thomas Kluyver <[hidden email]> wrote:
> On 13 April 2012 15:41, Thomas Wiecki <[hidden email]> wrote:
>> However, in ipython, the sys.path includes the system wide packages
>> before the extra-search-dir. How does this happen?
>
> Have you installed IPython inside the virtualenv? If not, please do
> and see if the problem continues.

Yes, that fixes the problem, thanks!

> If you have, how is an extra-search-dir specified? I'm not all that
> familiar with virtualenv features.

It puts the paths into a .pth file that lives in the virtual-env
site-package dir.

Thomas

> Thomas
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[Thomas Kluyver-2]

On 13 April 2012 17:04, Thomas Wiecki <[hidden email]> wrote:
>> Have you installed IPython inside the virtualenv? If not, please do
>> and see if the problem continues.
>
> Yes, that fixes the problem, thanks!

OK, great.

For 0.13, we're going to have basic virtualenv support - so if a
virtualenv is active when you start IPython, it will put the
virtualenv library directories on sys.path. But this is deliberately
minimal: if you want to use any more advanced features of virtualenv
(such as ignoring system packages), you will need to install IPython
inside the virtualenv.

Thomas
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