[Python-ideas] Counter comparison

[MRAB]

On 2014-11-22 01:36, Antony Lee wrote:
> I guess it depends on whether you think {"a": 1} < {"a": 2, "b": -1} 
> or not.  I actually thought about it and initially decided that the 
> inequality should hold, but given that most_common works fine with 
> negative counts, perhaps it shouldn't, indeed.
>
The other point is that if the 'b' entry was in the first, then it would 
be checked, and the negative count would matter, but as it wasn't, it 
won't, and it won't.

> 2014-11-21 16:27 GMT-08:00 MRAB <python at mrabarnett.plus.com 
> <mailto:python at mrabarnett.plus.com>>:
>
>     On 2014-11-21 23:55, Antony Lee wrote:
>
>         As Counter objects effectively behave like multi-sets, it seems
>         reasonable to overload <, <=, >, >= as for set objects to
>         check whether
>         a Counter is a sub/super-set of another Counter:
>
>         c < d  <===>  all(c[k] < d[k] for k in c)
>
>         Thoughts?
>
>     More correctly, it would be:
>
>         all(c[k] < d[k] for k in set(c) | set(d))
>