Use black style and other pre-commit hooks.

Plugins added:
black
trailing-whitespace
end-of-file-fixer
check-yaml

Author: youtux

.pre-commit-config.yaml

@@ -0,0 +1,14 @@
+# See https://pre-commit.com for more information
+# See https://pre-commit.com/hooks.html for more hooks
+repos:
+-   repo: https://github.com/psf/black
+    rev: 19.3b0
+    hooks:
+    - id: black
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.3.0
+    hooks:
+    -   id: trailing-whitespace
+    -   id: end-of-file-fixer
+    -   id: check-yaml
+    -   id: check-added-large-files

pyproject.toml

@@ -0,0 +1,3 @@
+[tool.black]
+line-length = 120
+target-version = ['py27', 'py35', 'py36', 'py37', 'py38']