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

Fri Jan 15 04:26:26 PST 2016

e.g.
http://stackoverflow.com/questions/14050281/how-to-check-if-a-python-module-exists-without-importing-it

Luigi Pirelli

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On 15 January 2016 at 13:24, Luigi Pirelli <luipir at gmail.com> wrote:

> btw an exception can be caouse by other dependencies of openpyxl => better
> to check the correct exception than a generic one
>
> Luigi Pirelli
>
>
> **************************************************************************************************
> * Boundless QGIS Support/Development: lpirelli AT boundlessgeo DOT com
> * LinkedIn: https://www.linkedin.com/in/luigipirelli
> * Stackexchange: http://gis.stackexchange.com/users/19667/luigi-pirelli
> * GitHub: https://github.com/luipir
> * Mastering QGIS:
> https://www.packtpub.com/application-development/mastering-qgis
>
> **************************************************************************************************
>
> On 15 January 2016 at 13:23, Luigi Pirelli <luipir at gmail.com> wrote:
>
>> thank you for sharing
>>
>> Luigi Pirelli
>>
>>
>> **************************************************************************************************
>> * Boundless QGIS Support/Development: lpirelli AT boundlessgeo DOT com
>> * LinkedIn: https://www.linkedin.com/in/luigipirelli
>> * Stackexchange: http://gis.stackexchange.com/users/19667/luigi-pirelli
>> * GitHub: https://github.com/luipir
>> * Mastering QGIS:
>> https://www.packtpub.com/application-development/mastering-qgis
>>
>> **************************************************************************************************
>>
>> On 15 January 2016 at 12:12, Pablo Fernández Moniz <
>> pablofernandezmoniz at gmail.com> wrote:
>>
>>> 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
>>>> * Geospatial web development
>>>> * GIS Training
>>>> * Consulting Services
>>>>
>>>> Skype: timlinux Irc: timlinux on #qgis at freenode.net
>>>> Tim is a member of the QGIS Project Steering Committee
>>>>
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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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>>>>
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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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>>>
>>
>>
>
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