My Code

#! /usr/bin/python

import gi
import subprocess
gi.require_version("Gtk", "3.0")
from gi.repository import Gtk, GLib


class EntryWindow(Gtk.Window):
    def __init__(self):
        Gtk.Window.__init__(self, title="Notejot Input")
        self.set_size_request(300, 100)
        self.set_decorated(False)
        self.timeout_id = None

        vbox = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=3)
        self.add(vbox)

        self.entry = Gtk.Entry()
        self.entry.set_placeholder_text("Add to 'Notejot'...")
        vbox.pack_start(self.entry, True, True, 0)
        self.set_focus(self.entry)


def f(text,ddd):
    #return subprocess.run("~/Scripts/notejot-add.sh "+str(text),shell=True)
    return subprocess.run("echo hmm",shell=True)

win = EntryWindow()
x = str(win.entry.get_text())
win.entry.connect('activate', f, str(win.entry.get_text()))
win.connect("destroy", Gtk.main_quit)
win.show_all()
Gtk.main()