[Python-3000] optimizing [x]range

[Georg Brandl]

Johan Dahlin schrieb:
> Guido van Rossum wrote:
>> Do we really need another way to spell a <= x < b?
> 
> FWIW, I'd say yes; I sometimes find it a bit difficult to remember
> how the operator should be placed, there are several possible ways
> of making a mistake, eg;
> 
>    a > x < b
>    a < x > b
>    a < x < b
>    a > x > b
> 
> Now, the range syntax seems a bit strange at first, but I find it easier 
> to parse:
> 
>    if x in range(a, b)
> 
> There's no way to incorrectly parse that, it's immediately known that 
> the programmer tries to see whether x is in a specific range.

What about floats?

Currently, "3.5 in range(5)" is False, while "0 <= 3.5 < 5" is True.

Georg

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