Getting nautilus to recognize a key press using the python-nautilus extension

Hi.  I'm not subscribed to this list so I'd appreciate to be CC'd on a 
reply so that I can receive it.  I have nautilus 3.18.5 running on an 
ubuntu 16.04.2 updated system.  The reason I'm writing is to ask a 
question about the python-nautilus extension of nautilus.  I'm trying to 
get nautilus to recognize a key combination on the keyboard to then have 
it run a script on the currently selected file(s)/folder(s).  To ensure 
that this is possible, I searched on the web and found a site[1] that 
describes that this is possible, so I decided to use the script that it 
mentions was re-written for nautilus 3[2] and modify it just to test if 
nautilus at least recognizes the key press by opening a gnome-terminal 
if it does.  Below is the brief modified code.  Can anyone explain why 
the key press is not recognized for me?  All I want is to get nautilus 
to recognize a key press and then run a script on the currently selected 
files.  Any help would be appreciated.  Thank you.

[1] 
http://zverovich.net/2011/02/18/user-defined-keyboard-shortcuts-in-nautilus.html
[2] 
https://github.com/vitaut/captain-nemo/raw/master/misc/shortcut-nautilus3.py

import os, pipes, urllib
from gi.repository import Nautilus, GObject, Gtk, Gdk

class ShortcutProvider(GObject.GObject, Nautilus.LocationWidgetProvider):
     def __init__(self):
         self.accel_group = Gtk.AccelGroup()
         self.accel_group.connect_group(ord('g'), 
Gdk.ModifierType.CONTROL_MASK,
             Gtk.AccelFlags.VISIBLE, self.run_copy_to_remote_google_drive)
         self.window = None

     def run_copy_to_remote_google_drive(self, accel_group, 
acceleratable, keyval, modifier):
         filename = urllib.unquote(self.uri[7:])
         os.system('/usr/bin/gnome-terminal &')
         return True

     def get_widget(self, uri, window):
         self.uri = uri
         if self.window:
             self.window.remove_accel_group(self.accel_group)
         window.add_accel_group(self.accel_group)
         self.window = window
         return None
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