Sympy 1.9 support (!239) · Merge requests · pycodegen / pystencils · GitLab

Merged Michael Kuron requested to merge pickle into master Apr 26, 2021

deepcopy support was broken due to https://github.com/sympy/sympy/pull/21260
clean up some constructors
fix detection of sympy development versions

fixes #35 (closed), fixes !237 (closed)