add pre-commit with black, flake8, and whitespace fixers

Author: basnijholt

.pre-commit-config.yaml

@@ -0,0 +1,16 @@
+repos:
+-   repo: https://github.com/ambv/black
+    rev: 19.3b0
+    hooks:
+    - id: black
+      language_version: python3.7
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.1.0
+    hooks:
+    -   id: end-of-file-fixer
+    -   id: trailing-whitespace
+-   repo: https://gitlab.com/pycqa/flake8
+    rev: 3.7.4
+    hooks:
+    -   id: flake8
+        args: ['--max-line-length=500', '--ignore=E203,E266,E501,W503', '--max-complexity=18', '--select=B,C,E,F,W,T4,B9']

README.rst

@@ -113,6 +113,14 @@ please setup the git filter by executing
 
 in the repository.
 
+We implement several other checks in order to maintain a consistent code style. We do this using [pre-commit`](https://pre-commit.com), execute
+
+.. code:: bash
+
+    pre-commit install
+
+in the repository.
+
 Credits
 -------
 

azure-pipelines.yml

@@ -24,3 +24,8 @@ steps:
 - script: ./check_whitespace
   continueOnError: true
   displayName: 'Whitespace check'
+
+- script: |
+    source activate adaptive
+    black . --check -t py36
+  displayName: 'Run lint tests'

test-requirements.txt

@@ -3,3 +3,4 @@ pytest
 pytest-cov
 pytest-randomly
 pytest-timeout
+pre_commit