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 received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/6821930c-117b-4b15-abec-f003782dcf85n%40googlegroups.com.