[Numpy-discussion] linux wheels coming soon

Paul Hobson pmhobson at gmail.com
Thu Apr 14 15:59:39 EDT 2016

On Thu, Apr 14, 2016 at 12:07 PM, Nathaniel Smith <njs at pobox.com> wrote:

> On Apr 14, 2016 11:11 AM, "Benjamin Root" <ben.v.root at gmail.com> wrote:
> >
> > Are we going to have to have documentation somewhere making it clear
> that the numpy wheel shouldn't be used in a conda environment? Not that I
> would expect this issue to come up all that often, but I could imagine a
> scenario where a non-scientist is simply using a base conda distribution
> because that is what IT put on their system. Then they do "pip install
> ipython" that indirectly brings in numpy (through the matplotlib
> dependency), and end up with an incompatible numpy because they would have
> been linked against different pythons?
> >
> > Or is this not an issue?
> There are always issues when you have two different package managers
> maintaining separate and out-of-sync metadata about what they think is
> installed, but that's true for any mixed use of conda and pip.
> But:
> - pip won't install a numpy that is incompatible with your python, unless
> Anaconda is actively breaking cpython's standard abi (they aren't) or
> there's a bug in pip (possible, but no reports yet).
> - conda packages for python packages like numpy do generally include the
> .egg-info / .dist-info directories that pip uses to store its installation
> metadata, so pip can "see" packages installed by conda (but not
> vice-versa). So "pip install matplotlib" won't drag in a pypi numpy if
> there's already a conda numpy installed.
Minor clarification:. I believe conda can see pip-installed packages.

If I execute "conda list" in an environment, I can see packaged installed
by both pip, conda, and locally (i.e., "pip install . -e").

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