I've had good luck with CloudPickle, a package, when Pickle doesn't work.
________________________________
From: sympy@googlegroups.com <sympy@googlegroups.com> on behalf of Thomas Ligon
<thomassli...@gmail.com>
Sent: Saturday, January 28, 2023 8:38:46 AM
To: sympy <sympy@googlegroups.com>
Subject: [sympy] pickle for Function and Derivative
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"
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