Conda-forge python 3.9 builds seem to be failing because

The tp_print slot of PyTypeObject has been removed.

Seeing this error in build logs (https://dev.azure.com/conda-forge/84710dde-1620-425b-80d0-4cf5baca359d/_apis/build/builds/222714/logs/95):

minepy/mine.c:7856:33: error: no member named 'tp_print' in 'struct _typeobject'

See also conda-forge/minepy-feedstock#3