[QGIS-Developer] External python package dependency in plugins

[shiva reddy]

It does not work in python console of QGIS.
pip have __main__() methot that too for internal use.


Thanks & Regards
Shiva Reddy K.
Scientist/Engineer 'SD'
Indian Institute of Remote Sensing,
Indian Space Research Organisation
Department of Space
4-Kalidas Road
Dehradun
mobile: 8791806093


On Sun, Jul 8, 2018 at 11:58 AM Luke Pinner <lukepinnerau at gmail.com> wrote:

> Rather than using a subprocess and needing to figure out which pip/python
> etc., have you tried importing and using the pip module directly? Something
> like:
>
> import sys
>
> try:
>     import matplotlib
> except:
>     import pip    pip.main(['install', 'matplotlib'])    import matplotlib
>
> Luke
>
> On Sun., 8 Jul. 2018, 15:42 Axel Andersson, <axel.n.c.andersson at gmail.com>
> wrote:
>
>> Hi,
>>
>> I added this to my code just 3 days ago :)
>>
>> import sys
>>
>> try:
>>     import matplotlib
>> except:
>>     import subprocess
>>     print('installing matplotlib')
>>     subprocess.call([sys.exec_prefix + '/python', "-m", 'pip', 'install', 'matplotlib'])
>>     import matplotlib
>>     print('installation completed')
>>
>>
>> I dont know if it is a better or worse solution, I've only tested it on a
>> Windows machine with the standalone version and the osgeo4w installation.
>>
>> I tried calling sys.executable first, instead of sys.exec_prefix +
>> '/python', which resulted in a new qgis window started :)
>>
>> Axel
>>
>> On 7 July 2018 at 14:23, Richard Duivenvoorde <rdmailings at duif.net>
>> wrote:
>>
>>> On 07/07/2018 01:26 PM, shiva reddy wrote:
>>> > Thanks,
>>> > In OS X following works:
>>> > subprocess.call(['pip3','install','pyxform'])
>>> >
>>> > Does same works  works for Ubuntu/linux also?
>>> >
>>> > for windows, I am assuming 'python' refers to python 3 inside QGIS3.
>>>
>>> Yep:
>>>
>>> import subprocess
>>> subprocess.call(['pip3','install','pyxform','--user'])
>>>
>>> works too.
>>>
>>> But as said, not sure if all distro's call the python3 pip: pip3 (and/or
>>> python3). I still would be afraid to force a specific version of a
>>> module, as I would be afraid to override some excisting one.
>>> I do like your solution though, the libs end up in my user site-packages
>>> dir:
>>> /home/richard/.local/lib/python3.5/site-packages
>>>
>>>
>>> Ah: http://zetcode.com/lang/python/introspection/
>>> >>> import sys
>>> >>> sys.executable
>>> '/usr/bin/python3'
>>>
>>> gives you your actual python exe...
>>>
>>> I wonder if you can create an venv from within QGIS in the subprocess
>>> way.
>>> Mmm, this works (from within QGIS):
>>>
>>> >>> import sys
>>> >>> py_exe = sys.executable
>>> >>> venv_path =
>>> '/home/richard/.local/share/QGIS/QGIS3/profiles/default/venv'
>>> >>> subprocess.call([py_exe,'-m','venv', venv_path])
>>>
>>> Had to install python3-venv though:
>>> sudo apt-get install python3-venv
>>>
>>> sourcing it does not work with me:
>>>
>>> >>> subprocess.call(['source', venv_path+'/bin/activate'])
>>> FileNotFoundError: [Errno 2] No such file or directory: 'source'
>>>
>>> Now somebody with more knowledge of the different python-path/lib-dir's
>>> should come in, to tell us if this is usable after activating that
>>> venv...
>>>
>>> Not sure if this would work with the already running python interpreter
>>> in QGIS...
>>>
>>> Idea's?
>>>
>>> Regards,
>>>
>>> Richard Duivenvoorde
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>>
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