PyGobject error

Question

#!/usr/bin/python
# -*- coding: utf-8 -*-
from gi.repository import Gtk
class ourwindow(Gtk.Window):
def __init__(self):
Gtk.Window.__init__(self, title="My Hello World Program")
Gtk.Window.set_default_size(self, 400,325)
Gtk.Window.set_position(self, Gtk.WindowPosition.CENTER)
button1 = Gtk.Button("Hello, World!")
button1.connect("clicked", self.whenbutton1_clicked)
self.add(button1)
def whenbutton1_clicked(self, button):
print "Hello, World!"
window = ourwindow()        
window.connect("delete-event", Gtk.main_quit)
window.show_all()
Gtk.main()

This Python+GTK code is giving me the following error:

./pygtk.py
./pygtk.py:3: PyGIWarning: Gtk was imported without specifying a version      first. Use gi.require_version('Gtk', '3.0') before import to ensure that the right version gets loaded.
 from gi.repository import Gtk
 Traceback (most recent call last):
 File "./pygtk.py", line 4, in <module>
 class ourwindow(Gtk.Window):
 File "./pygtk.py", line 10, in ourwindow
 button1.connect("clicked", self.whenbutton1_clicked)
 NameError: name 'self' is not defined

It also gives me an indentaion error. I am new to Python and GTK. Thanks in advance.

PyGObject can be used with both GTK+ 2 and GTK+ 3 and you need to choose one. Which one do you want to use? (Note that PyGTK is something entirely different.) And Python has strict indentation rules. I recommend reading both [a Python tutorial](https://docs.python.org/3/tutorial/) (this one covers Python 3) and a [Python GTK+ tutorial](http://python-gtk-3-tutorial.readthedocs.io/en/latest/) (this covers GTK+ 3, which is the version I recommend). — andlabs, Sep 23 '16 at 13:10
Is that how your code is indented? If not, then could you format it to match the original? — Teemu Risikko, Sep 23 '16 at 13:13
@TeemuRisikko the "It also gives me an indentaion error." implies that that is how their code is indented, further implying they are too new to Python. — andlabs, Sep 23 '16 at 13:13
@andlabs Well not necessarily, the code could have an indentation error even though it is different from the one pasted here. — Teemu Risikko, Sep 23 '16 at 13:15
@TeemuRisikko : I referred this link , http://www.tecmint.com/create-gui-applications-in-linux/ The same code has been posted. — claw107, Sep 23 '16 at 13:18
Ok, then no wonder it does not work, the code in the link does not have indentation. — Teemu Risikko, Sep 23 '16 at 13:21

Teemu Risikko · Accepted Answer · 2016-09-23T13:26:08.557

This is most likely how it should be formatted:

#!/usr/bin/python
# -*- coding: utf-8 -*-
from gi.repository import Gtk

class ourwindow(Gtk.Window):
    def __init__(self):
        Gtk.Window.__init__(self, title="My Hello World Program")
        Gtk.Window.set_default_size(self, 400,325)
        Gtk.Window.set_position(self, Gtk.WindowPosition.CENTER)
        button1 = Gtk.Button("Hello, World!")
        button1.connect("clicked", self.whenbutton1_clicked)
        self.add(button1)

    def whenbutton1_clicked(self, button):
        print "Hello, World!"

window = ourwindow()        
window.connect("delete-event", Gtk.main_quit)
window.show_all()
Gtk.main()

I would definitely recommend you to read some basic Python tutorial to at least understand the syntax. Easier to do GUI stuff when you know the basics of the language.

PyGobject error

1 Answers1