[Python-ideas] Make range objects orderable

[MRAB]

On 2015-04-24 01:15, Ethan Furman wrote:
> On 04/23, Riley Banks wrote:
>
>> I propose adding the ability to compare range objects using methods (e.g.
>> range.issubrange) and/or regular operators. Example:
>>
>>     In [56]: range(0, 10, 3).issubrange(range(10))
>>     Out[56]: True
>>
>>     In [57]: range(0, 10, 3) <= range(10)
>>     Out[57]: True
>>
>>     In [58]: range(10) <= range(0, 10, 3)
>>     Out[58]: False
>
> I seem to recall orderable ranges being rejected before.  For example, is
> less-than, or subrange, dependent on the values themselves, or on the
> lowest and highest values, or on the start and end value, or ...
>
> In other words, given:
>
>    a = range(11)
>    b = range(12, step=3)
>
> is a < b, or b < a?  Why?
>
It could be functionally equivalent to list(a) < list(b).