[Qgis-developer] Managing Python dependencies automatically for the user

[Pablo Fernández Moniz]

First of all, thank you very much for all the fast replies, they have been
very helpful for us.

 The solution we finally implemented was adding the .egg file for the
dependency and loading it when the wider system import fails in the
following fashion:

import os
import sys

try:
    import openpyxl
except:
    package_name = "openpyxl-2.3.2-py2.7.egg"
    package_path = os.path.join(os.path.dirname(__file__), package_name)
    sys.path.append(package_path)
    import openpyxl

 This may not be a solution for every use case but it gets the job done for
us in our setup.

 Once again, thank you for he fast replies and ideas given.

 Kind regards,

2016-01-15 4:40 GMT+00:00 Andreas Neumann <a.neumann at carto.net>:

> Note that the Windows binaries already contain xlwt and xlrd. Jürgen was
> so kind to include it, because I needed it as well for my plugins. Not sure
> about openpyxl. On Linux systems it is rather easy to install them through
> apt-get, pip or similar mechanisms. Just tell your users that/how they
> need/can install them.
>
> Andreas
>
>
> On 14.01.2016 22:13, Matthias Kuhn wrote:
>
> Hi Pablo, Tim
>
> On 01/14/2016 10:00 PM, Tim Sutton wrote:
>
> Hi
>
> On 14 Jan 2016, at 18:06, Pablo Fernández Moniz <
> pablofernandezmoniz at gmail.com> wrote:
>
> Hi!
>
>  We are currently developing a QGIS plugin were we wish to generate some
> Excel files as output.
>
>  In order to build the spreadsheet file we need to use some python modules
> installed from pip (openpyxl, xlwt, etc). This dependency will force every
> user to manually install the needed package form the pip repository.
>
>  This situation leaves us with the following question: is possible or it
> will be in the future to manage this kind of dependencies from QGIS side
> when the user installs the plugin?
>
>
> Although it has been discussed and some prototyping was done to support
> automatic installation of dependencies at the last hackfest, there isn’t
> anything in the released versions of QGIS to support this yet. If your
> packages have no operating system specific binaries in them, then I suggest
> to bundle them into your plugin and use an appropriate import path relative
> to your code. Note there is a limit on how big your plugin can be (I think
> it is 10mb) so you need to ensure your 3rd party deps do not bulk out your
> plugin too much.
>
>
> We bundled xlwt and xlrd as .egg with a plugin recently:
>
> https://github.com/opengisch/shpsync/blob/master/xlwt-1.0.0-py2.7.egg
> https://github.com/opengisch/shpsync/blob/master/xlrd-0.9.4-py2.7.egg
>
> Until there's a cross-platform dependency management (which I know that
> several people are looking into) that's the safest road to follow.
>
> Best
>
> Matthias
>
>
> Regards
>
> Tim
>
>
>  Thank you for your time!
>
>  Kind regards.
>
> --
>
> Pablo Fernández Moniz
> GIT Analyst
>
> Web <http://www.pablofm.com/>    Linkedin
> <http://www.linkedin.com/in/pablofernandezmoniz/>   Twitter
> <http://www.twitter.com/monizpablo>
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>
> —
>
>
>
>
> Tim Sutton
>
> Visit  <http://kartoza.com>http://kartoza.com to find out about open
> source:
>
> * Desktop GIS programming services
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> * GIS Training
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>
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>
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>
>
>
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>
> --
> Matthias Kuhn
> OPENGIS.ch - https://www.opengis.ch
> Spatial • (Q)GIS • PostGIS • Open Source
>
>
>
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-- 

Pablo Fernández Moniz
GIT Analyst

Web <http://www.pablofm.com>    Linkedin
<http://www.linkedin.com/in/pablofernandezmoniz/>   Twitter
<http://www.twitter.com/monizpablo>
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