Fix scoped enum class in Cython with a workaround
Fix scoped enum class in Cython with a workaround

https://github.com/cython/cython/issues/1603

symengine/symengine.py,symengine/symengine.py,bjodah/symengine.py,symengine/symengine.py,bjodah/symengine.py,bjodah/symengine.py