AMICI requires sympy > 1.6

[jonrkarr]

To Reproduce

import amici

Produces

    import amici
/usr/local/lib/python3.7/site-packages/amici/__init__.py:134: in <module>
    from .sbml_import import SbmlImporter, assignmentRules2observables
/usr/local/lib/python3.7/site-packages/amici/sbml_import.py:26: in <module>
    from .ode_export import (
/usr/local/lib/python3.7/site-packages/amici/ode_export.py:35: in <module>
    from sympy.printing.cxx import _CXXCodePrinterBase
E   ModuleNotFoundError: No module named 'sympy.printing.cxx'

AMICI version and system environment

• OS and version: [e.g. Ubuntu, iOS, Windows]: Ubuntu
• AMICI interface: [e.g. Python, Matlab, C++]: Python
• AMICI version: 0.11.11
• Additional information: Compiler name and version used, Python/Matlab version, ...

How to fix
This is fixed by installing a more recent version of sympy (e.g., 1.7.1). I suspect the minimum required version is 1.7

setup.py needs to be updated to reflect the new requirement.

[dweindl]

Thanks for reporting, @jonrkarr. Seems like this wasn't fully resolved by #1356. Now requiring sympy>=1.7.1 in #1368.