boltons should be builtins. Boltons is a set of over 160 BSD-licensed, pure-Python utilities in the same spirit as--and yet conspicuously missing from--the standard library.
copied from cf-staging / boltonsconda install conda-forge::boltons
conda install conda-forge/label/cf201901::boltons
conda install conda-forge/label/cf202003::boltons
conda install conda-forge/label/gcc7::boltons