[Tutor] while loops / listeners

[Francesco Loffredo]

Hi all,
I think that simply erasing those "continue" statements will let Python 
respond again. Those statements are both useless and damaging, because 
the following "time.sleep(.1)" statements will NEVER be executed. And 
this, in turn, is IMHO the reason why Python stops responding: it lacks 
the time to do so.
Hope that helps
Francesco

Il 07/06/2010 5.09, Alex Hall wrote:
> Hi all,
> First off, I apologize to the list for my previous thread; somehow,
> despite my having written the post, it ended up blank (????)
>
> I have a main loop which will continue for as long as neither player1
> nor player2 has won. Inside that loop I have a call to a function
> which should basically wait until the user completes a turn, then
> return, exiting this loop and returning to the main loop, the one
> looping until there is a winner. Once back there, the second player's
> idling function is called; once that user completes a turn, the main
> loop switches back to the first user, and so on. Here is the main
> loop:
>   player1.takeTurn() #someone has to start off the game
>
>   #now loop until someone wins...
>   while not player1.isWinner and not player2.isWinner:
>    if player1.grid.turnOver: #player1 is done for this turn
>     player1.grid.speak("player 2 is going.")
>     #lock p1 out of the window, unlock p2, and then loop p2 until s/he
> does something
>     player1.lock(); player2.unlock(); player2.takeTurn()
>    else: #player2 has completed a turn
>     player2.grid.speak("player 1 is going.")
>     #opposite of above - lock p2, unlock p1, loop until p1 is done
>     player2.lock(); player1.unlock(); player1.takeTurn()
>    #end if
>    continue #is this doing anything?
>    time.sleep(.1) #again, is this important?
>   #end while
>
> The lock and unlock functions are simply there to disable and enable
> keyboard/mouse commands, respectively, so lock causes the player's
> screen to stop responding to input while unlock unfreezes the screen.
> This way, if you and I are playing a game, I can't keep shooting even
> if my turn is over.
> TakeTurn() is that smaller loop I was talking about:
>   def takeTurn(self):
>    while not self.grid.turnOver: #turnOver is true once a turn-ending
> function is called in grid
>     continue
>     time.sleep(.1)
>    #end while
>   #end def
>
> That is inside the Player class. Grid is just another object that is
> really the most important part of all the game logic; Grid holds the
> wx frame on which everything is drawn, the boolean to tell if the turn
> is over, the ships, and more. That is why the function checks
> self.grid.turnOver, instead of just self.turnOver; turnOver tells if
> the player has performed a move that ends a turn or not. Firing ends a
> turn, while just moving around does not.
>
> The question, then, is this: when I run the code, Windows says
> "python.exe has stopped responding". I know that this is because it is
> getting stuck, probably in the takeTurn() loop. Ordinarily, a
> situation like this would probably call for:
> while ok:
>   ok=#program logic
>
> The hard part with my program, though, is that all input is set up
> with a wx.AcceleratorTable object, so I cannot just dump everything
> into a huge while loop and have it process that way. What I am looking
> for is some kind of listener object, so that I can just monitor
> self.grid.turnOver and call a function, or perform a few lines of
> code, when the listener detects a change in turnOver. On the other
> hand, there may be something simple that I am missing in my while loop
> that would cause the problem of python.exe crashing to not happen
> (well, not crashing, but rather not responding). I hope it is the
> latter problem, but I am not sure what else I could add to the loop(s)
> to stop this problem. Thanks, and sorry again for the blank message;
> still not sure how that happened. Hopefully this one works!
>
>
>
>
>
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