[Tutor] curses class problem

[Sammy Mannaert]

hi,


i'm trying to build a curses class wrapper (to abstract a 
screen). i'm not an experienced curses user though.
i was trying to do a __init__ and a __del__ function and
already it fails :)

Exception exceptions.AttributeError: "'None' object has no attribute 'echo'" in <method
Screen.__del__ of Screen instance at 0x819c92c> ignored

i have programmed in python quite some times before but
i can't figure out why this doesn't work ...

it DOES work however if i add self.curses = curses and call
every curses function as 'self.curses.rest_of_the_function'

====== the code ======

# abstraction of a screen

import curses

class Screen:
    def __init__(self):
	self.stdscr = curses.initscr()
	curses.noecho()
	curses.cbreak()
	self.stdscr.keypad(1)

    def __del__(self):
	self.stdscr.keypad(0)
    	curses.echo()
	curses.nocbreak()
	curses.endwin()


# testroutine	
if __name__ == "__main__":
    screen = Screen()
    
    

===== end =====

any help/explenation is appreciated :)