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How to show Screen keyboard ubuntu with python

#!/usr/bin/env python3
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk
import signal
import subprocess

class CallKeyboardTest:

    def __init__(self):
        
        # window definition
        window = Gtk.Window(title="Test 123")
        window.connect('destroy', Gtk.main_quit)
        # maingrid
        maingrid = Gtk.Grid()
        maingrid.set_border_width(12)
        window.add(maingrid)
        # two different fields, one is calling the keyboard, the other isn't
        testfield = Gtk.Entry()
        testfield.connect('focus-in-event', self.focus_in)
        testfield.connect('focus-out-event', self.focus_out)
        otherfield = Gtk.Entry()
        maingrid.attach(testfield, 0, 0, 1, 1)
        maingrid.attach(otherfield, 0, 1, 1, 1)
        window.show_all()
        Gtk.main()
        
    def focus_out(self, entry, event):
        subprocess.Popen(["pkill", "onboard"])

    def focus_in(self, entry, event):
        subprocess.Popen("onboard")

    def stop_prefs(self, *args):
        Gtk.main_quit()

if __name__ == "__main__":
    CallKeyboardTest()

Source: askubuntu.com

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