Replace psycopg2-binary with pg8000 and black with ruff (#25)

* Replace psycopg2-binary with pg8000

psycopg2 is licensed under LGPL that's not compatible with ASF -
https://www.apache.org/legal/resolved.html#category-x

* Replace black with ruff

black depends on pathspec that is licensed under MPL 2.0. Even though
MPL 2.0 can _maybe_ be included in an ASF project, I'd
prefer to simplify the discussion and just replace black with ruff that
is licensed as Apache 2.0, does not have any dependencies, and is
already used by other Apache projects.

CONTRIBUTING.md

@@ -32,7 +32,7 @@ See the [poetry docs](https://python-poetry.org/docs) for more.
 
 # Linting and formatting
 
-Code-style is enforced using [black](https://black.readthedocs.io/) and [flake8](https://flake8.pycqa.org/); import optimisation is handled by [isort](https://pycqa.github.io/isort/) and [autoflake](https://pypi.org/project/autoflake/).  Linting is automatically applied when tox runs tests; if linting fails, you can fix trivial problems with:
+Code-style is enforced using [ruff](https://docs.astral.sh/ruff/) and [flake8](https://flake8.pycqa.org/); import optimisation is handled by [isort](https://pycqa.github.io/isort/) and [autoflake](https://pypi.org/project/autoflake/).  Linting is automatically applied when tox runs tests; if linting fails, you can fix trivial problems with:
 
 ```
 ./toxw -e format

hunter/postgres.py

@@ -2,7 +2,7 @@
 from datetime import datetime
 from typing import Dict
 
-import psycopg2
+import pg8000
 
 from hunter.analysis import ChangePoint
 from hunter.test_config import PostgresTestConfig
@@ -29,9 +29,9 @@ class Postgres:
     def __init__(self, config: PostgresConfig):
         self.__config = config
 
-    def __get_conn(self) -> psycopg2.extensions.connection:
+    def __get_conn(self) -> pg8000.dbapi.Connection:
         if self.__conn is None:
-            self.__conn = psycopg2.connect(
+            self.__conn = pg8000.dbapi.Connection(
                 host=self.__config.hostname,
                 port=self.__config.port,
                 user=self.__config.username,
@@ -43,7 +43,7 @@ def __get_conn(self) -> psycopg2.extensions.connection:
     def fetch_data(self, query: str):
         cursor = self.__get_conn().cursor()
         cursor.execute(query)
-        columns = [c.name for c in cursor.description]
+        columns = [c[0] for c in cursor.description]
         return (columns, cursor.fetchall())
 
     def insert_change_point(

pyproject.toml

@@ -10,7 +10,6 @@ expandvars = "^0.6.5"
 numpy = "1.24"
 python = ">=3.8,<3.13"
 python-dateutil = "^2.8.1"
-psycopg2-binary = "^2.9.3"
 signal-processing-algorithms = "^1.3.2"
 "ruamel.yaml" = "=0.17.21"
 requests = "^2.25.1"
@@ -19,16 +18,17 @@ tabulate = "^0.8.7"
 validators = "^0.18.2"
 slack-sdk = "^3.4.2"
 google-cloud-bigquery = "^3.25.0"
+pg8000 = "^1.31.2"
 
 
 [tool.poetry.dev-dependencies]
 pytest = "^6.2.2"
 pytz = "2021.1"
 tox = "^3.25.0"
-black = "^22.3.0"
 flake8 = "^4.0.1"
 autoflake = "^1.4"
 isort = "^5.10.1"
+ruff = "^0.6.9"
 
 [tool.pytest.ini_options]
 filterwarnings = [
@@ -39,7 +39,7 @@ filterwarnings = [
 [tool.poetry.scripts]
 hunter = 'hunter.main:main'
 
-[tool.black]
+[tool.ruff]
 line-length = 100
 
 [tool.isort]

tox.ini

@@ -19,20 +19,20 @@ passenv =
     SSH_AUTH_SOCK
 setenv =
     BUILD_DIR = {toxinidir}/build/{envname}
-    BLACK_OPTS =
+    RUFF_OPTS =
     FLAKE8_OPTS = --count --show-source --statistics
     AUTOFLAKE_OPTS = --exclude build --recursive --remove-all-unused-imports
     POETRY_OPTS = -v
     PYTEST_OPTS =
 
     # Linting should be quiet and fast
-    lint: BLACK_OPTS = --quiet --fast
+    lint: RUFF_OPTS = --quiet --fast
     lint: FLAKE8_OPTS =
     lint: POETRY_OPTS = --quiet --no-root
 commands_pre =
     ./poetryw install {env:POETRY_OPTS}
 commands =
-    black {env:BLACK_OPTS} --check --diff .
+    ruff {env:RUFF_OPTS} check --diff .
     autoflake {env:AUTOFLAKE_OPTS} --check .
     isort --check --diff .
     flake8 {env:FLAKE8_OPTS}
@@ -43,7 +43,7 @@ commands =
 # environment
 [testenv:format]
 commands =
-    black .
+    ruff check --fix .
     autoflake {env:AUTOFLAKE_OPTS} --in-place .
     isort .