(2021) https://news.ycombinator.com/item?id=29005573#29009072 :

python-feedstock / recipe / meta.yml: https://github.com/conda-forge/python-feedstock/blob/master/...

pypy-meta-feedstock can be installed in the same env as python-feedstock; https://github.com/conda-forge/pypy-meta-feedstock/blob/main...