On 3 February 2017 at 09:58, Tadej Janež <tade...@nez.si> wrote:
> So, this apparently boils down to:
>
> 1) If one uses "python3 -m venv --system-site-packages myvenv3", then
> no pip executable is installed in myvenv3/bin/.
> As a consequence, "pip install foo" fails since it tries to install foo
> in system's global site-packages directory.
> Using "python -m pip install foo" works as expected.
>
> 2) If one uses "python3 -m venv myvenv3-no-system", then pip (and pip3)
> executables are installed in myvenv3-no-system/bin/.
> Both, "pip install foo" and "python -m pip install foo" work as
> expected.
>
> Is this something specific to Fedora's Python 3 packaging?
> If not, I'll post a question to the distutils mailing list.
It's not specific to Fedora's Python 3 packaging as such, but it *is*
specific to:
- using --system-site-packages
- having pip install in the system site packages
However, the way Fedora handles the native venv support in Python 3
means that this case will *always* apply when creating Python 3
virtual environments that can see the virtual environments - the pip
that gets installed into the virtual environment comes from
python-pip, rather than being a bundled copy in the Python RPM.
That means you have to pass "--ignore-installed" to get pip to
actually install into the virtual environment properly:
(venv2) $ which pip
/usr/bin/pip
(venv2) $ python -m pip install --ignore-installed pip
Collecting pip
Using cached pip-9.0.1-py2.py3-none-any.whl
Installing collected packages: pip
(venv2) $ which pip
/tmp/venv2/bin/pip
I think that makes sense at least as a BZ against the Fedora Python 3
package (to pass --ignore-installed when installing components into
the venv), and it may even make sense to file it as a bug against
CPython upstream as well, since it will happen any time you have the
three way combination of:
- system wide installation of pip
- using native stdlib venv creation
- the created venv is configured to have access to the system site packages
Cheers,
Nick.
--
Nick Coghlan | ncogh...@gmail.com | Brisbane, Australia
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