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remove Python2/3 bridging capability
The previous script allowed running an internal Python 3.6 installation so black could be used even with a Python 2.7 base installation. Since we now only support 3.6+ developer installs this entire logic can be scrapped. Existing developer installations should not be affected.
embrace conda
Similarly, we only support the precommit installation logic in a conda environment. If you have your own setup then you can set up pre-commits manually, but this use case will no longer be supported by our automated precommit setup. Again, existing setups will not be affected.
modernize code
lru_cache. pathlib. f-strings!