GTK 3
import gi
gi.require_version("Gtk", "3.0")
from gi.repository import Gtk
win = Gtk.Window()
button = Gtk.Button(label="Click here")
win.add(button)
win.connect("destroy", Gtk.main_quit)
win.show_all()
Gtk.main()
Label
label = Gtk.Label(label="Hello World", angle=25, halign=Gtk.Align.END)
label = Gtk.Label()
label.set_label("Hello World")
label.set_angle(25)
label.set_halign(Gtk.Align.END)