I have opened https://github.com/sagemath/sage/issues/35572 to deal with this
On Wed, Apr 26, 2023 at 10:27 AM dimpase <dimp...@gmail.com> wrote:
>
> On Tue, Apr 25, 2023 at 11:08:02PM -0700, 'Nasser M. Abbasi' via sage-devel
> wrote:
> > I read integrals from a file. They all are stored as strings.
> >
> > Then use SR('expression') inside sagemath to convert them to sagemath
> > symbolic expression before calling integrate.
> >
> > Some give parsing error.
> >
> > Is using SR('expression') not the correct way to convert string to a
> > symbolic expression?
> >
> > I am using 9.8 on Linux. Here is an example
> >
> > >sage
> > │ SageMath version 9.8, Release Date: 2023-02-11 │
> > │ Using Python 3.11.1. Type "help()" for help. │
> >
> > sage: hypergeometric((3/2,), (5/2, 3), -1/4*3^2)
> > hypergeometric((3/2,), (5/2, 3), -9/4)
> >
> > You see, there is no error. But now if put the expression inside string and
> > use SR, it gives error:
>
> IMHO Sage gives no promise that the way an SR expression printed is
> always readable back as a string.
> Note that
>
> SR('hypergeometric([3/2,], [5/2, 3], -1/4*3^2)')
>
> works just fine.
>
>
> >
> >
> > sage: SR('hypergeometric((3/2,), (5/2, 3), -1/4*3^2)')
> > ---------------------------------------------------------------------------
> > SyntaxError Traceback (most recent call last)
> > File ~/TMP/sage-9.8/src/sage/symbolic/expression.pyx:13706, in
> > [...]
> > SyntaxError: Mismatched parentheses
> >
> > During handling of the above exception, another exception occurred:
> >
> > [...]
> >
> >
> >
> > Is this a bug or Am I doing something wrong? This happens on very few
> > cases, not all the time. The above is an example where SR gives an error.
>
> What are other examples which give errors like this?
>
> Perhaps hypergeomertic() should come with a special __repr__() function
> to show the 1st two arguments as lists rather than in its internal
> representation as tuples. (Or should it be _repr_() ? )
>
>
> Dima
>
>
> >
> > Thanks
> > --Nasser
> >
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