On Jul 4, 7:50 pm, Christophe <[email protected]> wrote:
> > Python has a builtin set data type. For example:
>
> >>>> x= [1,2,3,5,2,1]
> >>>> set(x)
>
> > set(1, 2, 3, 5)
>
> > Sympy has an Interval class, but it seems at the moment it doesn't
> > have things like the intersection / union operators, nor whether the
> > interval is open or closed.
>
> > I'm not sure if this Interval class was intended for the application
> > you mentioned, but if so, we should add some functionality, it
> > wouldn't be very hard. The file is:
> > sympy/core/interval.py
>
The interface would have to be changed to take a descriptor of whether
the set is open or closed, wouldn't it? But maybe you could make the
start and end values be a tuple and change the corresponding start and
end property definitions. So you could create an interval (3,4] like
Interval((3,0),(4,1))
And the default could be a closed set (i.e. Interval(3,4) would be
[3,4])
There is a package available that already handles intervals as has
been requested that is available at
http://members.cox.net/apoco/interval/
I found this on the listing of packages at http://pypi.python.org/pypi/
.
/c
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