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

[Matthias Kuhn]

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
>
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-- 
Matthias Kuhn
OPENGIS.ch - https://www.opengis.ch
Spatial • (Q)GIS • PostGIS • Open Source

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