add python-black

emacs.d/custom.el

@@ -4,7 +4,7 @@
  ;; Your init file should contain only one such instance.
  ;; If there is more than one, they won't work right.
  '(package-selected-packages
-   '(cython-mode scss-mode vue-mode tide rust-mode company-auctex tex-site auctex sphinx-doc company-lsp lsp-ui lsp-mode ws-butler use-package smartparens pip-requirements osx-clipboard monokai-theme markdown-mode helm-projectile helm-ag godoctor go-guru go-eldoc go-autocomplete flycheck-gometalinter doom-modeline dockerfile-mode docker-compose-mode diminish company-go company-anaconda)))
+   '(python-black cython-mode scss-mode vue-mode tide rust-mode company-auctex tex-site auctex sphinx-doc company-lsp lsp-ui lsp-mode ws-butler use-package smartparens pip-requirements osx-clipboard monokai-theme markdown-mode helm-projectile helm-ag godoctor go-guru go-eldoc go-autocomplete flycheck-gometalinter doom-modeline dockerfile-mode docker-compose-mode diminish company-go company-anaconda)))
 (custom-set-faces
  ;; custom-set-faces was added by Custom.
  ;; If you edit it by hand, you could mess it up, so be careful.

emacs.d/layers/python/init.el

@@ -26,5 +26,12 @@
   :hook (python-mode . sphinx-doc-mode)
   :commands sphinx-docs-mode)
 
+;; Enable `black`ing files
+;; https://github.com/wbolster/emacs-python-black
+(use-package python-black
+  :demand t
+  :after python
+  :hook (python-mode . python-black-on-save-mode))
+
 ;; Enable Flycheck for python
 (enable-flycheck 'python-mode-hook)