Installing additional python packages in qgis
1) Add environmental variables for user PYTHONPATH e.g. C:\Program Files\QGIS\apps\Python27\Lib; C:\Program Files\QGIS\apps\Python27\DLLs 2)Download ez_setup.py http://nathanw.net/2012/12/19/installing-python... and put it into bin folder of QGIS 3) go into the bin folder and start python.exe ez_setup.py 4) Add into system variable PATH C:\Program Files\QGIS\apps\Python27\Scripts 5) Execute easy_install package_name e.g. psycopg2