Ciaran Mooney wrote:
> Sent: Thursday, December 20, 2012 3:35 PM
> To: d...@davea.name
> Cc: tutor@python.org
> Subject: Re: [Tutor] invalid literal for int error in Game loop
>
> Thanks for the feedback.
>
> Steve, If I set the FPS to a default of say 30, the game seems to run at this
> default FPS=30 regardless of the
> key pressed in the function.
>
> Dave, If I remove the the default value at the start of the function and add
> it to elif in the loop I get the
> following error:
>
>
> Traceback (most recent call last):
> File "/Users/callanmooneys/Desktop/Pythoin Programmes/Aliens Game/dodger
> ver 3 instructons.py", line 139, in
> <module>
> FPS = difficultyLevel()
> File "/Users/callanmooneys/Desktop/Pythoin Programmes/Aliens Game/dodger
> ver 3 instructons.py", line 50, in
> difficultyLevel
> return FPS
> UnboundLocalError: local variable 'FPS' referenced before assignment
If you read Dave's comment a little closer you will see that
he suggests adding an *else* block not another elif.
(pseudocode)
if key == b:
FPS = 30
elif key == m:
FPS = 60
elif key == h:
FPS = 120
else:
FPS = 15 # or whatever default value you want
>
>
> I wondered if i could set FPS to nether a string or integer and just declare
> it by setting FPS=None but I get
> the following error:
>
> Traceback (most recent call last):
> File "/Users/callanmooneys/Desktop/Pythoin Programmes/Aliens Game/dodger
> ver 3 instructons.py", line 301, in
> <module>
> mainClock.tick(FPS)
> TypeError: a float is required
The else clause prevents FPS from being anything other than a number.
You can choose to predefine FPS or just let the if/else tree take
care of defining it.
>
> Cheers
> Ciaran
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