feat: update python versions as part of update_dependencies (#496)

* Update python versions as part of update_dependencies

* refactor: pulling out to update_pythons

* refactor: rewrite and expect install

* feat: support macos too, logging output

* WIP: update

* refactor: drive from original file

* Remove unused variable

* Output a diff instead of the result file, to review changes more easily

* fix: minor cleanup

Co-authored-by: Henry Fredrick Schreiner <henry.fredrick.schreiner@cern.ch>
Co-authored-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: Joe Rickerby <joerick@mac.com>

.pre-commit-config.yaml

@@ -16,12 +16,20 @@ repos:
   hooks:
   - id: isort
 
+- repo: https://github.com/psf/black
+  rev: 20.8b1
+  hooks:
+  - id: black
+    files: ^bin/update_pythons.py$
+    args: ["--line-length=120"]
+
 - repo: https://github.com/pre-commit/mirrors-mypy
   rev: v0.790
   hooks:
   - id: mypy
-    files: ^(cibuildwheel/|test/|bin/projects.py|unit_test/)
+    files: ^(cibuildwheel/|test/|bin/projects.py|bin/update_pythons.py|unit_test/)
     pass_filenames: false
+    additional_dependencies: [packaging, click]
 
 - repo: https://github.com/asottile/pyupgrade
   rev: v2.7.4