[Tutor] critique my script!

[Christopher Spears]

I made the changes that Danny suggested to my script:

#!/usr/bin/python

import os, pygtk
pygtk.require('2.0')
import gtk

class View:
	
	def delete_event(self, widget, event, data=None):
        	gtk.main_quit()
        	return False
		
	def button_pressed(self, widget, data=None):
        	self.on_button_pressed()
		
	def __init__(self,title, button_text):
		self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)
		self.window.set_title(title)
		self.window.set_border_width(10)
		self.window.connect("delete_event",
self.delete_event)
		
		def do_nothing():
			pass
		
		self.on_button_pressed = do_nothing
		
		self.box = gtk.HBox(False, 0)
		self.window.add(self.box)
		self.button = gtk.Button(button_text)
		self.button.connect("clicked", self.button_pressed)
		self.box.pack_start(self.button, True, True, 0)

		self.button.show()
		self.box.show()
		self.window.show()
		
	def main(self):
		gtk.main()
		
if __name__ == "__main__":
	view = View("Hello World!", "Press me please!")
	
	#def print_getcwd():
		#print os.getcwd()
		
	def say_hello():
		print "Hello World!"
	view.on_button_pressed = say_hello
	
	view.main()
	
I can apparently call the functions sometimes without
().  Why is that?