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From: Oscar Benjamin <oscar.j.benjamin@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: ANN: intervalset Was: Set type for datetime intervals
Date: Mon, 4 Apr 2016 16:32:32 +0100
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On 4 April 2016 at 16:09, Random832 <random832@fastmail.com> wrote:
> On Mon, Apr 4, 2016, at 03:12, Nagy L=C3=A1szl=C3=B3 Zsolt wrote:
>>
>>   Hi All,
>>
>> If anyone is interested, a module was born:
>>
>> https://bitbucket.org/nagylzs/intervalset
>> https://pypi.python.org/pypi/intervalset/0.1.1
>
> I don't know if I like it being immutable. Maybe have separate mutable
> and immutable versions.
>
> Like I said before, I don't think the set-like operations on Intervals
> are useful - what can you accomplish with them rather than by making a
> set consisting of only one interval and doing operations on that?

I guess it depends what your application is but sympy has interval
sets and can do computation on them to represent the solutions of
equations/inequalities (many other types of set are also included).
For example:

In [1]: from sympy import Interval

In [2]: Interval
Out[2]: sympy.core.sets.Interval

In [3]: Interval(1, 2)
Out[3]: [1, 2]

In [4]: help(Interval)


In [5]: Interval(1, 2) & Interval(3, 4)
Out[5]: =E2=88=85

In [6]: Interval(1, 2) | Interval(3, 4)
Out[6]: [1, 2] =E2=88=AA [3, 4]

There is some discussion about why it's good to do this stuff with
sets (for sympy's purposes here):
http://docs.sympy.org/latest/modules/solvers/solveset.html#why-do-we-use-se=
ts-as-an-output-type

--
Oscar