Drop support for end-of-life Python 3.8

Remove backports.zoneinfo dependency

Author: damian3031

.github/workflows/ci.yml

@@ -41,7 +41,6 @@ jobs:
       fail-fast: false
       matrix:
         python: [
-          "3.8",
           "3.9",
           "3.10",
           "3.11",

README.md

@@ -2,7 +2,7 @@
 
 Client for [Trino](https://trino.io/), a distributed SQL engine for interactive and batch big data processing.
 Provides a low-level client and a DBAPI 2.0 implementation and a SQLAlchemy adapter.
-It supports Python>=3.8 and PyPy.
+It supports Python>=3.9 and PyPy.
 
 [![Build Status](https://github.com/trinodb/trino-python-client/workflows/ci/badge.svg)](https://github.com/trinodb/trino-python-client/actions?query=workflow%3Aci+event%3Apush+branch%3Amaster)
 [![Trino Slack](https://img.shields.io/static/v1?logo=slack&logoColor=959DA5&label=Slack&labelColor=333a41&message=join%20conversation&color=3AC358)](https://trino.io/slack.html)

setup.py

@@ -70,7 +70,6 @@
         "Operating System :: Microsoft :: Windows",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
@@ -79,9 +78,8 @@
         "Programming Language :: Python :: Implementation :: PyPy",
         "Topic :: Database :: Front-Ends",
     ],
-    python_requires=">=3.8",
+    python_requires=">=3.9",
     install_requires=[
-        "backports.zoneinfo;python_version<'3.9'",
         "python-dateutil",
         "pytz",
         # requests CVE https://github.com/advisories/GHSA-j8r2-6x86-q33q

tests/integration/test_dbapi_integration.py

@@ -15,11 +15,7 @@
 from datetime import date, datetime, time, timedelta, timezone
 from decimal import Decimal
 from typing import Tuple
-
-try:
-    from zoneinfo import ZoneInfo
-except ModuleNotFoundError:
-    from backports.zoneinfo import ZoneInfo
+from zoneinfo import ZoneInfo
 
 import pytest
 import requests

tests/integration/test_types_integration.py

@@ -3,11 +3,7 @@
 import uuid
 from datetime import date, datetime, time, timedelta, timezone, tzinfo
 from decimal import Decimal
-
-try:
-    from zoneinfo import ZoneInfo
-except ModuleNotFoundError:
-    from backports.zoneinfo import ZoneInfo
+from zoneinfo import ZoneInfo
 
 import pytest
 

tests/unit/test_client.py

@@ -18,6 +18,7 @@
 from typing import Any, Dict, Optional
 from unittest import TestCase, mock
 from urllib.parse import urlparse
+from zoneinfo import ZoneInfoNotFoundError
 
 import gssapi
 import httpretty
@@ -59,11 +60,6 @@
     _RetryWithExponentialBackoff,
 )
 
-try:
-    from zoneinfo import ZoneInfoNotFoundError  # type: ignore
-except ModuleNotFoundError:
-    from backports.zoneinfo._common import ZoneInfoNotFoundError  # type: ignore
-
 
 @mock.patch("trino.client.TrinoRequest.http")
 def test_trino_initial_request(mock_requests, sample_post_response_data):

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py37,py38,py39,py310,py311
+envlist = py39,py310,py311
 
 [testenv]
 extras = tests

trino/client.py

@@ -47,20 +47,15 @@
 from email.utils import parsedate_to_datetime
 from time import sleep
 from typing import Any, Dict, List, Optional, Tuple, Union
-
-from trino.mapper import RowMapper, RowMapperFactory
-
-try:
-    from zoneinfo import ZoneInfo
-except ModuleNotFoundError:
-    from backports.zoneinfo import ZoneInfo
+from zoneinfo import ZoneInfo
 
 import requests
 from tzlocal import get_localzone_name  # type: ignore
 
 import trino.logging
 from trino import constants, exceptions
 from trino._version import __version__
+from trino.mapper import RowMapper, RowMapperFactory
 
 __all__ = ["ClientSession", "TrinoQuery", "TrinoRequest", "PROXIES"]
 

trino/dbapi.py

@@ -27,11 +27,7 @@
 from time import time
 from typing import Any, Dict, List, NamedTuple, Optional  # NOQA for mypy types
 from urllib.parse import urlparse
-
-try:
-    from zoneinfo import ZoneInfo
-except ModuleNotFoundError:
-    from backports.zoneinfo import ZoneInfo
+from zoneinfo import ZoneInfo
 
 import trino.client
 import trino.exceptions

trino/mapper.py

@@ -2,16 +2,11 @@
 
 import abc
 import base64
-import sys
 import uuid
 from datetime import date, datetime, time, timedelta, timezone, tzinfo
 from decimal import Decimal
 from typing import Any, Dict, Generic, List, Optional, Tuple, TypeVar
-
-if sys.version_info >= (3, 9):
-    from zoneinfo import ZoneInfo
-else:
-    from backports.zoneinfo import ZoneInfo
+from zoneinfo import ZoneInfo
 
 import trino.exceptions
 from trino.types import (