gtk

import gi
gi.require_version('Gtk' , '3.0')
from gi.repository import Gtk

class Handler:
    def onDestroy(self, *args):
        Gtk.main_quit()

builder = Gtk.Builder()
builder.add_from_file("grep.glade")
builder.connect_signals(Handler())

window = builder.get_object("Main_Window")
window.set_title("Grep")

#menu
main_menu_bar = Gtk.MenuBar()

#rozwijane Menu
file_menu = Gtk.Menu()
file_menu_dropdown = Gtk.MenuItem("Plik")
help_menu = Gtk.Menu()
help_menu_dropdown = Gtk.MenuItem("Pomoc")

#file menu items
qtk_main_quit = Gtk.MenuItem("Wyjscie")
qtk_help_about = Gtk.MenuItem("O Programie")

file_menu_dropdown.set_submenu(file_menu)
file_menu.append(Gtk.SeparatorMenuItem())
file_menu.append(qtk_main_quit)

help_menu_dropdown.set_submenu(help_menu)
help_menu.append(Gtk.SeparatorMenuItem())
help_menu.append(qtk_help_about)

main_menu_bar.append(file_menu_dropdown,help_menu_dropdown)

#koniec menu

labelL = builder.get_object("label15")
labelC = builder.get_object("label13")
labelR = builder.get_object("label16")
checkButtonL = builder.get_object("radiobutton1")
checkButtonC = builder.get_object("radiobutton2")
checkButtonR = builder.get_object("radiobutton3")

def onChangeSide(widget):#, event):
    tekst = "Grep\nv.0.1 beta"
    labelL.set_text(tekst)
    if checkButtonL.get_active():
        labelL.set_text(tekst)
        labelC.set_text('')
        labelR.set_text('')
    elif checkButtonC.get_active():
        labelC.set_text(tekst)
        labelL.set_text('')
        labelR.set_text('')
    elif checkButtonR.get_active():
        labelR.set_text(tekst)
        labelL.set_text('')
        labelC.set_text('')

checkButtonL.connect("clicked", onChangeSide)
checkButtonC.connect("clicked", onChangeSide)
checkButtonR.connect("clicked", onChangeSide)

textField = builder.get_object("output")

textBuffer = Gtk.TextBuffer()
textField.set_buffer(textBuffer)

textLink = builder.get_object("entry1")
buttonOk = builder.get_object("button2")

def saveToFile(widget, event):
    start_iter = textBuffer.get_start_iter()
    end_iter = textBuffer.get_end_iter()

    file = open(textLink.get_text(), "w")
    file.write(textBuffer.get_text(start_iter, end_iter, False))
    file.close()

buttonOk.connect("button_press_event", saveToFile)

window.show_all()

Gtk.main()