[Distutils] Transfering modules

Wayne Werner waynejwerner at gmail.com
Fri Aug 18 07:57:38 EDT 2017

You could potentially also run `/path/to/python3.6.2/bin/python3 -m pip
install $(/path/to/python3.6.1/bin/python3 -m pip freeze)`, naturally
replacing path with the correct path. pip freeze lists the versions of
things you have installed.


On Fri, Aug 18, 2017, 3:03 AM Nick Coghlan <ncoghlan at gmail.com> wrote:

> On 18 August 2017 at 12:17, Ian Hartley <iahartle at ucsd.edu> wrote:
> > Hello,
> >
> > I have a question that I haven't been able to find online or in the
> python
> > documentation.
> > While trying to install a module I have encountered significant trouble,
> > stalling my current experiment.
> >
> > I recently installed python 3.6.2, and I want to know how to transfer the
> > numerous modules I have on 3.6.1 to the newest version, usable by an
> > interpreter.
> Without knowing more about your system (operating system, where you
> installed Python from, how you're installing Python dependencies),
> it's hard to say what might be going wrong, since most mechanisms for
> upgrading Python will treat 3.6.2 as a direct replacement for 3.6.1,
> and hence you shouldn't have to do anything at all to start using
> Python 3.6.2 instead (since they're part of the same feature release
> stream, they'll both use `3.6` to qualify the directories they access,
> and hence should be able to see the same set of importable modules).
> However, from your comments, it sounds like you managed to do a
> parallel install instead, in which case the answers would be:
> 1. Don't do that, as you'll make life more difficult for yourself by
> defeating the main point of offering in-place maintenance updates
> 2. If you really need to do it, *and* you're using a virtual
> environment to manage your dependencies, then you can technically
> change which Python an existing virtual environment is using by
> fiddling with the symlinks (but I wouldn't recommend it)
> 3. If you're *not* using a virtual environment to manage your
> dependencies, then running `python3 -m site` with each version will
> tell you where their respective site-packages are, so you can copy all
> the files from your 3.6.1 installation to your new 3.6.2 installation
> (although again, I wouldn't really recommend it)
> The ideal case would be having all your dependencies listed in a
> requirements.txt file, so setting up a new virtual environment would
> just be a matter of activating it and then running "pip install -r
> requirements.txt". (Or, equivalently, define a conda environment file
> and set up your experimental system with "conda env create":
> https://conda.io/docs/using/envs.html#create-environment-file-by-hand)
> Cheers,
> Nick.
> --
> Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
> _______________________________________________
> Distutils-SIG maillist  -  Distutils-SIG at python.org
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