149 added sympy as an explicit import, so it should be listed in the dependencies in the Python package metadata or the import should be made optional. At the moment, this is a minor point because sympy is a dependency of qiskit-terra, but that might not always be the case. This was pointed out by the conda-forge dependency checker in https://github.com/conda-forge/qiskit-dynamics-feedstock/pull/3.
149 added sympy as an explicit import, so it should be listed in the dependencies in the Python package metadata or the import should be made optional. At the moment, this is a minor point because sympy is a dependency of qiskit-terra, but that might not always be the case. This was pointed out by the conda-forge dependency checker in https://github.com/conda-forge/qiskit-dynamics-feedstock/pull/3.