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

[Andreas Neumann]

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 
>>> <mailto: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 to find out about open source:
>>
>> * Desktop GIS programming services
>> * Geospatial web development
>> * GIS Training
>> * Consulting Services
>>
>> Skype: timlinux Irc: timlinux on #qgis at freenode.net 
>> <http://freenode.net>
>> Tim is a member of the QGIS Project Steering Committee
>>
>> Kartoza is a merger between Linfiniti and Afrispatial
>>
>>
>>
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>
> -- 
> Matthias Kuhn
> OPENGIS.ch -https://www.opengis.ch
> Spatial • (Q)GIS • PostGIS • Open Source
>
>
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