Toby Donaldson schrieb:

>Hi,
>
>I think speed method is definitely a good thing --- students in my
>class have asked for that. And I think Gregor's addition of checking
>the range of the input value is a good idea, since I've seen a number
>of students fooled by such things
>  
>
I'd like to point out, that I didn't change the working of the code. I 
only replaced

       if speed >=0 and speed <=4:    ## more elegantly:

by

       if 0 <= speed <=4:    

However, I have to do some remarks on the speed-function. 
I'll do this this evening.

Best wishes, 
Gregor


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