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Is there any way to get the QGIS installation path programmatically?

I'm working on something similar to plugin installer and it would be great to have it.

1 Answer 1

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In my GNU/Linux Debian, at the Python Console of QGIS, I type:

>>>print QgsApplication.showSettings()

and I got:

Application state:
QGIS_PREFIX_PATH env var:       
Prefix:     /usr
Plugin Path:        /usr/lib/qgis/plugins
Package Data Path:  /usr/share/qgis
Active Theme Name:  default
Active Theme Path:  /home/zeito/.qgis2///themes/default/icons/
Default Theme Path: :/images/themes/default/
SVG Search Paths:   /usr/share/qgis/svg/
        /home/zeito/.qgis2//svg/
User DB Path:   /usr/share/qgis/resources/qgis.db
Auth DB Path:   /home/zeito/.qgis2//qgis-auth.db

You can also assign print command to a variable for using it programmatically after some string manipulations and by using regular expressions python module (re). For example:

import re

def getPattern(keyword, L):

    list = [ item for item in L if re.search(keyword, item) is not None ]

    return list 

qgis_paths = QgsApplication.showSettings()
qgis_paths = qgis_paths.split('\n')

print getPattern('Package', qgis_paths)

that produces:

[u'Package Data Path:\t/usr/share/qgis']

In this case, it was individualized the 'Package Data Path'.

Editing Note:

I found out that it could be easier with these commands:

print QgsApplication.pluginPath() #location of core plugins
print QgsApplication.prefixPath() #location where QGIS is installed
print QgsApplication.qgisSettingsDirPath() #location of user settings
print QgsApplication.iconsPath() #location of icons used in QGIS

where it's produced:

/usr/lib/qgis/plugins
/usr
/home/zeito/.qgis2//
/usr/share/qgis/images/icons/
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  • It's not exactly what I was looking for, but in some way it was helpful, so I will accept this answer.
    – DIV
    Mar 1, 2017 at 14:48

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