Setup code formatting and linting

.github/workflows/ci-core.yml

@@ -14,7 +14,7 @@ jobs:
         architecture: 'x64'
     - name: Install flake8
       run: |
-        pip install flake8 flake8-import-order
+        pip install flake8 isort flake8-isort
     - name: Lint python with flake8
       run: |
         flake8 . --max-complexity=10 --statistics

.isort.cfg

@@ -0,0 +1,5 @@
+[settings]
+force_single_line=true
+
+multi_line_output=7
+profile=black

DEVELOPMENT.md

@@ -19,8 +19,8 @@ Examples:
 
 - To update the submodule, you would still need to follow the contribution guide in the submodule repository. And then create a PR for the main repository with the updated submodule commit.
 
-
 ### Back end
+
 Install Python
 
 Install the ASReview package
@@ -37,6 +37,26 @@ For Windows, use
 	set FLASK_DEBUG=1
 	asreview lab
 
+#### Formatting and linting
+
+Use `flake8` to lint the Python code and format the code with `black`. Use
+`black[jupyter]` if you are editing the Jupyter notebooks. Use `isort` to
+sort the imports.
+
+Install the linters and formatters with:
+
+```sh
+pip install black[jupyter] flake8 flake8-isort isort
+```
+
+Run the following commands to lint and format:
+
+```sh
+black .
+isort .
+flake8 .
+```
+
 ### Front end
 
 Install both [npm][1] and Python
@@ -64,6 +84,11 @@ Open the web browser at `localhost:3000`
 
 **Important**: Ignore `localhost:5000`. You can also find a front end on `:5000` but this is not relevant for the current front end development step.
 
+[1]:	https://www.npmjs.com/get-npm
+[2]:	https://reactjs.org/
+
+#### Formatting and linting
+
 Please make use of Prettier (https://prettier.io/docs/en/install.html) to
 format React/Javascript code. Use the following code to format all files in
 the webapp folder.
@@ -73,9 +98,6 @@ cd asreview/webapp
 npx prettier --write .
 ```
 
-[1]:	https://www.npmjs.com/get-npm
-[2]:	https://reactjs.org/
-
 ## Authentication
 
 It is possible to run ASReview with authentication, enabling multiple users to run their

asreview/__init__.py

@@ -26,15 +26,15 @@
 
 from ._version import get_versions
 
-__version__ = get_versions()['version']
+__version__ = get_versions()["version"]
 del get_versions
 
 __all__ = [
-    'asreview_path',
-    'ASReviewData',
-    'ASReviewProject',
-    'get_data_home',
-    'list_readers',
-    'list_writers',
-    'open_state'
+    "asreview_path",
+    "ASReviewData",
+    "ASReviewProject",
+    "get_data_home",
+    "list_readers",
+    "list_writers",
+    "open_state",
 ]

asreview/__main__.py

@@ -36,19 +36,17 @@ def main():
     entry_points = get_entry_points("asreview.entry_points")
 
     if (
-        len(sys.argv) > 1 and
-        not sys.argv[1].startswith("-") and
-        sys.argv[1] not in entry_points
+        len(sys.argv) > 1
+        and not sys.argv[1].startswith("-")
+        and sys.argv[1] not in entry_points
     ):
         raise ValueError(f"'{sys.argv[1]}' is not a valid subcommand.")
 
     elif len(sys.argv) > 1 and sys.argv[1] in entry_points:
-
         entry = entry_points[sys.argv[1]]
         entry.load()().execute(sys.argv[2:])
 
     else:
-
         description_subcommands = ""
 
         for name, pkg_entry_points in groupby(