Drop Python 3.8 support (#484)

Now EOL:
https://discuss.python.org/t/python-3-8-is-now-officially-eol/66983 .

Author: adamchainz

.github/workflows/build.yml

@@ -21,7 +21,7 @@ jobs:
       CIBW_ARCHS_LINUX: x86_64 i686 aarch64
       CIBW_ARCHS_MACOS: x86_64 universal2
       CIBW_ARCHS_WINDOWS: AMD64 x86 ARM64
-      CIBW_BUILD: "cp38-* cp39-* cp310-* cp311-* cp312-* cp313-*"
+      CIBW_BUILD: "cp39-* cp310-* cp311-* cp312-* cp313-*"
 
     steps:
       - uses: actions/checkout@v4

.github/workflows/main.yml

@@ -18,7 +18,6 @@ jobs:
     strategy:
       matrix:
         python-version:
-        - 3.8
         - 3.9
         - '3.10'
         - '3.11'

.pre-commit-config.yaml

@@ -35,7 +35,7 @@ repos:
   rev: v3.17.0
   hooks:
   - id: pyupgrade
-    args: [--py38-plus]
+    args: [--py39-plus]
 - repo: https://github.com/psf/black-pre-commit-mirror
   rev: 24.8.0
   hooks:

CHANGELOG.rst

@@ -2,6 +2,8 @@
 Changelog
 =========
 
+* Drop Python 3.8 support.
+
 2.15.0 (2024-08-06)
 -------------------
 

README.rst

@@ -54,7 +54,7 @@ Use **pip**:
 
     python -m pip install time-machine
 
-Python 3.8 to 3.13 supported.
+Python 3.9 to 3.13 supported.
 Only CPython is supported at this time because time-machine directly hooks into the C-level API.
 
 
@@ -210,17 +210,13 @@ Timezone mocking
 
 If the ``destination`` passed to ``time_machine.travel()`` or ``Coordinates.move_to()`` has its ``tzinfo`` set to a |zoneinfo-instance2|_, the current timezone will be mocked.
 This will be done by calling |time-tzset|_, so it is only available on Unix.
-The ``zoneinfo`` module is new in Python 3.8 - on older Python versions use the |backports-zoneinfo-package|_, by the original ``zoneinfo`` author.
 
 .. |zoneinfo-instance2| replace:: ``zoneinfo.ZoneInfo`` instance
 .. _zoneinfo-instance2: https://docs.python.org/3/library/zoneinfo.html#zoneinfo.ZoneInfo
 
 .. |time-tzset| replace:: ``time.tzset()``
 .. _time-tzset: https://docs.python.org/3/library/time.html#time.tzset
 
-.. |backports-zoneinfo-package| replace:: ``backports.zoneinfo`` package
-.. _backports-zoneinfo-package: https://pypi.org/project/backports.zoneinfo/
-
 ``time.tzset()`` changes the ``time`` module’s `timezone constants <https://docs.python.org/3/library/time.html#timezone-constants>`__ and features that rely on those, such as ``time.localtime()``.
 It won’t affect other concepts of “the current timezone”, such as Django’s (which can be changed with its |timezone-override|_).
 

pyproject.toml

@@ -22,7 +22,7 @@ keywords = [
 authors = [
   { name = "Adam Johnson", email = "me@adamj.eu" },
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 classifiers = [
   "Development Status :: 5 - Production/Stable",
   "Framework :: Pytest",
@@ -31,7 +31,6 @@ classifiers = [
   "Natural Language :: English",
   "Operating System :: OS Independent",
   "Programming Language :: Python :: 3 :: Only",
-  "Programming Language :: Python :: 3.8",
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",

src/time_machine/__init__.py

@@ -7,22 +7,21 @@
 import sys
 import time as time_module
 import uuid
+from collections.abc import Awaitable
 from collections.abc import Generator
+from collections.abc import Generator as TypingGenerator
 from time import gmtime as orig_gmtime
 from time import struct_time
 from types import TracebackType
 from typing import Any
-from typing import Awaitable
 from typing import Callable
-from typing import Generator as TypingGenerator
-from typing import Tuple
-from typing import Type
 from typing import TypeVar
 from typing import Union
 from typing import cast
 from typing import overload
 from unittest import TestCase
 from unittest import mock
+from zoneinfo import ZoneInfo
 
 import _time_machine
 from dateutil.parser import parse as parse_datetime
@@ -43,19 +42,6 @@
     # Windows
     HAVE_TZSET = False
 
-if sys.version_info >= (3, 9):
-    from zoneinfo import ZoneInfo
-
-    HAVE_ZONEINFO = True
-else:
-    try:
-        from backports.zoneinfo import ZoneInfo
-
-        HAVE_ZONEINFO = True
-    except ImportError:  # pragma: no cover
-        HAVE_ZONEINFO = False
-
-
 try:
     import pytest
 except ImportError:  # pragma: no cover
@@ -97,10 +83,10 @@
 
 _F = TypeVar("_F", bound=Callable[..., Any])
 _AF = TypeVar("_AF", bound=Callable[..., Awaitable[Any]])
-TestCaseType = TypeVar("TestCaseType", bound=Type[TestCase])
+TestCaseType = TypeVar("TestCaseType", bound=type[TestCase])
 
 # copied from typeshed:
-_TimeTuple = Tuple[int, int, int, int, int, int, int, int, int]
+_TimeTuple = tuple[int, int, int, int, int, int, int, int, int]
 
 
 def extract_timestamp_tzname(
@@ -121,7 +107,7 @@ def extract_timestamp_tzname(
     elif isinstance(dest, float):
         timestamp = dest
     elif isinstance(dest, dt.datetime):
-        if HAVE_ZONEINFO and isinstance(dest.tzinfo, ZoneInfo):
+        if isinstance(dest.tzinfo, ZoneInfo):
             tzname = dest.tzinfo.key
         if dest.tzinfo is None:
             dest = dest.replace(tzinfo=dt.timezone.utc)
@@ -233,11 +219,6 @@ def start(self) -> Coordinates:
         _time_machine.patch_if_needed()
 
         if not coordinates_stack:
-            if sys.version_info < (3, 9):
-                # We need to cause the functions to be loaded before we patch
-                # them out, which is done by this internal function before:
-                # https://github.com/python/cpython/pull/19948
-                uuid._load_system_functions()
             uuid_generate_time_patcher.start()
             uuid_uuid_create_patcher.start()
 

tests/requirements/compile.py

@@ -19,7 +19,6 @@
         *sys.argv[1:],
     ]
     run = partial(subprocess.run, check=True)
-    run([*common_args, "--python", "3.8", "--output-file", "py38.txt"])
     run([*common_args, "--python", "3.9", "--output-file", "py39.txt"])
     run([*common_args, "--python", "3.10", "--output-file", "py310.txt"])
     run([*common_args, "--python", "3.11", "--output-file", "py311.txt"])

tests/requirements/py38.txt

@@ -15,18 +15,13 @@
 from unittest import SkipTest
 from unittest import TestCase
 from unittest import mock
+from zoneinfo import ZoneInfo
 
 import pytest
 from dateutil import tz
 
 import time_machine
 
-if sys.version_info >= (3, 9):
-    from zoneinfo import ZoneInfo
-else:
-    from backports.zoneinfo import ZoneInfo
-
-
 NANOSECONDS_PER_SECOND = time_machine.NANOSECONDS_PER_SECOND
 EPOCH_DATETIME = dt.datetime(1970, 1, 1, tzinfo=dt.timezone.utc)
 EPOCH = EPOCH_DATETIME.timestamp()

tests/test_time_machine.py

@@ -2,7 +2,7 @@
 requires =
     tox>=4.2
 env_list =
-    py{313, 312, 311, 310, 39, 38}
+    py{313, 312, 311, 310, 39}
 
 [testenv]
 package = wheel