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List:       macports-users
Subject:    Re: What is the best way of installing Python's scientific libraries in MacPorts?
From:       Artemio_González_López_via_macports-users <macports-users
Date:       2021-10-06 10:19:23
Message-ID: 1BF6943F-8768-4884-BF32-607C33EA1D59 () mac ! com
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> On Oct 6, 2021, at 12:20 AM, Ryan Schmidt <ryandesign@macports.org> wrote:
> 
> On Oct 4, 2021, at 08:43, Artemio González López wrote:
> 
> > 1. Should I activate python39 and decativate python37 before installing the 3.9 \
> > versions fo numpy, scipy and matplotlib?
> 
> It's not necessary. MacPorts handles dependencies for you. If you install e.g. \
> py39-numpy and python39 is not already active, MacPorts will activate it for you. 
> > Can both be active at the same time after that, or should I keep 3.7 inactive for \
> > good (or unistall it)?
> 
> You may keep as many different versions of python and its modules installed and \
> active at the same time as you wish. They are not supposed to conflict with one \
> another. If they do, file a bug report. 
> 
> > 2. Should I install (say) py-numpy or more specifically py39-numpy?
> 
> You should probably install the subport for the specific version of python that you \
> want, e.g. py39-numpy. 
> If you install py-numpy, that's just a stub port that installs nothing but a readme \
> file, and today it declares a dependency on py39-numpy so that gets installed as \
> well. At some time in the future, however, a py310-numpy might exist and the \
> py-numpy port would then change to depend on that. When you upgrade your ports, \
> py310-numpy would then be installed, in addition to py39-numpy which would remain \
> installed initially, however if you later run "sudo port reclaim" MacPorts might \
> remove py39-numpy if nothing that's installed depends on it anymore. This could \
> break programs you write if your programs specifically need py39-numpy. 
> 
> > 3. Is it OK if the 3.7 versions of the py-* package are active throughout this \
> > installation process (and afterwards), or should I also deactivate them?
> 
> See 1.
> 
> 

Hy Ryan,

Thanks an awful lot for your most informative comments and advice!

Artemio


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