Tester

#!/usr/bin/python

import dbus
bus = dbus.SessionBus()
proxy = bus.get_object("org.a11y.Bus", "/org/a11y/bus")
props = dbus.Interface(proxy, dbus_interface='org.freedesktop.DBus.Properties')

from gi.repository.Gio import Settings
settings = Settings('org.gnome.desktop.interface')

def dbusA11yIsEnabled():
    rv = props.Get('org.a11y.Status', 'IsEnabled')
    print 'dbusA11yIsEnabled: %s' % bool(rv)
    return rv

def dbusEnableA11y(enable):
    props.Set('org.a11y.Status', 'IsEnabled', enable)
    print 'dbusEnableA11y: enable is: %s' %enable

def gsettingsA11yIsEnabled():
    rv = settings.get_boolean("toolkit-accessibility")
    print 'gsettingsA11yIsEnabled: %s' % rv
    return rv

def gsettingsEnableA11y(enable):
    settings.set_boolean("toolkit-accessibility", enable)
    print 'gsettingsEnableA11y: enable is: %s' %enable

def reset(enable):
    print '\nsetting all to %s' % enable
    dbusEnableA11y(enable)
    gsettingsEnableA11y(enable)
    dbusA11yIsEnabled()
    gsettingsA11yIsEnabled()

reset(False)
print "\nenabling dbus only"
dbusEnableA11y(True)
dbusA11yIsEnabled()
gsettingsA11yIsEnabled()

reset(False)
print "\nenabling gsettings only"
gsettingsEnableA11y(True)
dbusA11yIsEnabled()
gsettingsA11yIsEnabled()