Thanks! That was easy and works fine.
On Saturday, January 28, 2023 at 11:20:04 PM UTC+1 Oscar wrote:
> On Sat, 28 Jan 2023 at 16:38, Thomas Ligon <thomas...@gmail.com> wrote:
> >
> > Should pickle work for Function and Derivative? I found Sympy issue
> #4297 and the answer seems to be no.
> > Nevertheless, here is what I have:
> > I have a private dictionary containing expressions of symbols, and
> everything works fine.
> > Then I created a new private dictionary that includes Function and
> Derivative, and I can't pickle it. Here are some code snippets:
> >
> > q1S, q2S = symbols('q1, q2')
> > q1F = Function('q1')
> > ...
> > varX = globals()['CuspData']
> > fileName = os.path.join(config.pickle_dir, 'CuspData.pckl')
> > f = open(fileName, "wb")
> > varX = {'q1d0': q1F(tS), 'q1d1': Derivative(q1F(tS), tS)} # test
> > #with evaluate(False): pickle.dump(varX, f)
> > pickle.dump(varX, f)
> > f.close()
> > The error is "Can't pickle q1: attribute lookup q1 on __main__ failed"
>
> You need to call the variable the same name as the function:
>
> q1 = Function('q1')
>
> --
> Oscar
>
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