Re: [Matplotlib-users] [matplotlib-devel] Easy problem working with dev library

[Eric F. <ef...@ha...>]

On 2015/05/16 3:20 PM, Paul Hobson wrote:
>
> On Saturday, May 16, 2015 at 14:58, Neil Girdhar <mis...@gm...
> <mailto:mis...@gm...>>, wrote:
>
>     Thanks, and if I want to revert my system to its old matplotlib?
>
> ​
> ​
> ​Assuming you cloned the repo from git, just checkout any revision you want.

But you have to rerun the "pip install -e ." or "setup.py develop" so 
that the extension code will be rebuilt if there were any extension code 
changes between revisions.

> ​
> If didn't clone from git, just reinstall matplotlib anyway you want.

It's not as simple as that, unfortunately, because different 
installation methods put things in different places.  For example, if 
you are on linux, the package manager will install the /usr tree while 
setup etc will install in the /usr/local tree.

The usual advice for getting around such problems is to use a fresh 
virtualenv (or conda environment if you are using Anaconda) for your 
development.  Alternatively you can use a user install to a location of 
your choice and then add that to your PYTHONPATH when you want to work 
in development mode, and remove it when you want to run with whatever 
python environment you had before.

Eric

>
>
>
>
> ​-Paul.
>
>
>
>
>     On Sat, May 16, 2015 at 5:52 PM, Paul Hobson <pmh...@gm...
>     <mailto:pmh...@gm...>> wrote:
>
>         After you've setup your development environment with all of the
>         MPL dependencies, navigate to the MPL source directory and
>         install it with:
>
>         $ python setup.py develop
>
>         or
>
>         $ pip install -e .
>
>         That'll create a link in site-packages (or whatever that
>         directory is) to the source directory. After you make changes to
>         the source code, you'll either need to use the "imp" module to
>         reload MPL and the submodule you changed. I typically find it
>         easier to just restart my python interpreter.
>         -Paul
>
>         On Sat, May 16, 2015 at 1:45 PM, Neil Girdhar
>         <mis...@gm... <mailto:mis...@gm...>> wrote:
>
>             How do I set it up so that I can import my local matplotlib
>             dev copy?
>
>             I tried making a sym-link to matplotlib/lib/matplotlib, but
>             it's giving me errors:
>
>                  import matplotlib.transforms as mtransforms
>             AttributeError: 'module' object has no attribute 'transforms'
>
>             Thanks,
>
>             Neil
>
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