Add black formatting (#1539)

.pre-commit-config.yaml

@@ -9,6 +9,7 @@ repos:
         files: "^connexion/"
         additional_dependencies:
           - flake8-rst-docstrings==0.2.3
+
   - repo: https://github.com/PyCQA/isort
     rev: 5.10.1
     hooks:
@@ -24,3 +25,19 @@ repos:
         name: isort tests
         files: "^tests/"
         args: ["--project", "conftest", "--thirdparty", "connexion", "--check-only", "--diff"]
+
+  - repo: https://github.com/psf/black
+    rev: 22.3.0
+    hooks:
+      - id: black
+        name: black
+        files: "^connexion/"
+        args: ["connexion"]
+      - id: black
+        name: black examples
+        files: "^examples/"
+        args: ["examples"]
+      - id: black
+        name: black tests
+        files: "^tests/"
+        args: ["tests"]

README.rst

@@ -583,8 +583,8 @@ Contributing to Connexion/TODOs
 We welcome your ideas, issues, and pull requests. Just follow the
 usual/standard GitHub practices.
 
-For easy development, please install connexion in editable mode with the :code:`tests` extra, and
-install the pre-commit hooks.
+For easy development, install connexion in editable mode with the :code:`tests` extra, and
+install the pre-commit hooks to automatically run black formatting and static analysis checks.
 
 .. code-block:: bash
 

connexion/__init__.py

@@ -31,4 +31,4 @@
 Api = FlaskApi
 
 # This version is replaced during release process.
-__version__ = '2020.0.dev1'
+__version__ = "2020.0.dev1"

connexion/apis/__init__.py

@@ -13,5 +13,4 @@
 """
 
 
-from .abstract import (AbstractAPI, AbstractRoutingAPI,  # NOQA
-                       AbstractSwaggerUIAPI)
+from .abstract import AbstractAPI, AbstractRoutingAPI, AbstractSwaggerUIAPI  # NOQA