[Tutor] Stopping a loop with user input in curses

[Jeff Shannon]

Lloyd Kvam wrote:

> The following should help:
>     stdscr.nodelay(1) # do not wait for a key press
>     while 1:
>         t = time.asctime()
>         clockWindow.addstr(1, 1, t)
>         clockWindow.refresh()
>     try:
>         c = stdscr.getch()
>         if c == ord('q'):
>         curses.beep()
>         break
>     except <NeedExceptionName here>: # might be stdscr.error
>             time.sleep(1)


This isn't quite right -- as written, the 'try:' block won't be executed 
until *after* the 'while 1:' loop ends (i.e., never).  To fix this, the 
entire try/except segment needs to be indented to the same level as the 
rest of the loop contents, instead of the level of the while statement, 
i.e. :

    stdscr.nodelay(1) # do not wait for a key press
    while 1:
        t = time.asctime()
        clockWindow.addstr(1, 1, t)
        clockWindow.refresh()
        try:
            c = stdscr.getch()
            if c == ord('q'):
            curses.beep()
            break
        except <NeedExceptionName here>: # might be stdscr.error
            time.sleep(1)

This may have been caused by a mailer error or some such, but 
indentation matters...

Jeff Shannon
Technician/Programmer
Credit International