Python GTK file chooser

gistfile1.py

#!/usr/bin/env python3

from gi.repository import Gtk


class FileChooserError(Exception):
    pass


class FileChooser(Gtk.FileChooserDialog):
    def __init__(self, parent=None, name="choose file"):
        Gtk.FileChooserDialog.__init__(
            self,
            name,
            parent,
            Gtk.FileChooserAction.OPEN,
            (Gtk.STOCK_CANCEL,
             Gtk.ResponseType.CANCEL,
             Gtk.STOCK_OPEN,
             Gtk.ResponseType.OK))

    def choose(self):
        response = self.run()
        if response == Gtk.ResponseType.OK:
            return self.get_filename()

        elif response in {Gtk.ResponseType.DELETE_EVENT,
                          Gtk.ResponseType.CANCEL}:

            raise FileChooserError("aborted")
        else:
            raise FileChooserError(str(Gtk.ResponseType(response)))

    def __enter__(self):
        return self

    def __exit__(self, type, value, traceback):
        self.destroy()


def choose_file():
    with FileChooser(None) as fch:
        return fch.choose()


while True:
    print(choose_file())