a question in python curses modules

[Marc 'BlackJack' Rintsch]

On Fri, 15 Feb 2008 11:55:11 +0800, Marco wrote:

> Hi, I wanna write a simple curses program, but somethings confuse
> me, my code here:
> 
> #!/usr/bin/python
> 
> import os
> import sys
> import time
> import curses
> 
> class CursesObject( object ):
> 
>     def __init__(self):
> 
>         self.STDSCR = curses.initscr()
>         curses.noecho()
>         curses.cbreak()
>         self.STDSCR.keypad(1)
> 
>     def __del__(self):
>         self.STDSCR.keypad(0)
>         curses.nocbreak()
>         curses.echo()
>         curses.endwin()
> 
> c1 = CursesObject()
> time.sleep(1)
> 
> 
> I donot know what happen, but in __del__ function, curses become None??!!

When the interpreter shuts down it has to remove objects.  Everything you
need in a `__del__()` method must be referenced by that object to be sure
that it is still there and not already garbage collected.  *But* it's not
guaranteed that `__del__()` is called at all!  So if you think this clean
up is necessary to leave a usable console then don't put it into a
`__del__()` method!

Ciao,
	Marc 'BlackJack' Rintsch