[Python-ideas] overloading chained comparison

[Greg Ewing]

Nathaniel Smith wrote:

> This does solve our problematic case above: only 'arr' implements
> __chain_comparison__, so we have
>   0 < x < arr
> becoming
>   arr.__chain_comparison__([0, x, arr], [operator.lt, operator.lt])

I don't see how that works, because you need to evaluate
arr in order to tell whether it has a __chain_comparison__
method. So chained comparisons would always have to evaluate
all operands and could never short-circuit.

-- 
Greg