Added black (code formatting) and isort (import sorting)

Author: mdesmet

.flake8

@@ -0,0 +1,11 @@
+[flake8]
+select =
+    E
+    W
+    F
+ignore =
+    W503 # makes Flake8 work like black
+    W504
+    E203 # makes Flake8 work like black
+    E741
+    E501

.pre-commit-config.yaml

@@ -13,3 +13,16 @@ repos:
         additional_dependencies:
           - "types-pytz"
           - "types-requests"
+
+  - repo: https://github.com/psf/black
+    rev: 22.3.0
+    hooks:
+      - id: black
+        args:
+          - "--line-length=99"
+
+  - repo: https://github.com/pycqa/isort
+    rev: 5.6.4
+    hooks:
+      - id: isort
+        args: [ "--profile", "black", "--filter-files" ]

README.md

@@ -424,6 +424,7 @@ We recommend that you use Python3's `venv` for development:
 $ python3 -m venv .venv
 $ . .venv/bin/activate
 $ pip install -e '.[tests]'
+$ pre-commit install
 ```
 
 With `-e` passed to `pip install` above pip can reference the code you are
@@ -441,6 +442,17 @@ When the code is ready, submit a Pull Request.
 See also Trino's [guidelines](https://github.com/trinodb/trino/blob/master/.github/DEVELOPMENT.md).
 Most of them also apply to code in trino-python-client.
 
+### `pre-commit` checks
+
+Code is automatically checked on commit by a [pre-commit](https://pre-commit.com/) git hook.
+
+Following checks are performed:
+
+- [`flake8`](https://flake8.pycqa.org/en/latest/) for code linting
+- [`black`](https://github.com/psf/black) for code formatting
+- [`isort`](https://pycqa.github.io/isort/) for sorting imports
+- [`mypy`](https://mypy.readthedocs.io/en/stable/) for static type checking
+
 ### Running tests
 
 `trino-python-client` uses [pytest](https://pytest.org/) for its tests. To run

setup.py

@@ -39,6 +39,9 @@
     "pytest",
     "pytest-runner",
     "click",
+    "pre-commit",
+    "black",
+    "isort",
 ]
 
 setup(