maintenance: drop support for EOL Python 3.8

According to Python life cycle:
https://devguide.python.org/versions/
https://peps.python.org/pep-0569/

> As of 2024-10-07, 3.8 has reached the end-of-life phase of its release
cycle. 3.8.20 was the final security release. The codebase for 3.8 is
now frozen and no further updates will be provided nor issues of any
kind will be accepted on the bug tracker.

- require Python 3.9+
- cleaned up code for Python 3.8 support
- run CI for Python 3.9+

Fixes: #83
Signed-off-by: Stanislav Levin <[email protected]>

.github/workflows/pipelines.yml

@@ -33,7 +33,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
 
     steps:
     - uses: actions/checkout@v4
@@ -63,7 +63,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
 
     steps:
     - uses: actions/checkout@v4
@@ -93,7 +93,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
 
     steps:
     - uses: actions/checkout@v4
@@ -122,7 +122,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
     steps:
     - uses: actions/checkout@v4
     - uses: actions/setup-python@v5

backend/wheel.py

@@ -170,9 +170,10 @@ def package_record(self):
         zinfo.compress_type = ZIP_DEFLATED
 
         self.records.append((str(dist_info_record), "", ""))
-        with self._zipfile.open(zinfo, "w") as f, TextIOWrapper(
-            f, encoding="utf-8", newline=""
-        ) as csvf:
+        with (
+            self._zipfile.open(zinfo, "w") as f,
+            TextIOWrapper(f, encoding="utf-8", newline="") as csvf,
+        ):
             writer = csv.writer(csvf, lineterminator="\n")
             writer.writerows(self.records)
 

pyproject.toml

@@ -2,7 +2,7 @@
 name = "pyproject-installer"
 description = "Pyproject installer"
 readme = "README.md"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 license = {text = "MIT"}
 authors = [
   {name = "Stanislav Levin", email = "[email protected]"},
@@ -15,7 +15,6 @@ classifiers = [
     "Operating System :: Unix",
     "Programming Language :: Python :: 3",
     "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/pyproject_installer/build_cmd/_build.py

@@ -116,39 +116,36 @@ def build_metadata(srcdir, outdir, config=None, verbose=False):
 
     hook = "prepare_metadata_for_build_wheel"
     logger.info("Building metadata with %s", hook)
-    with build_out_tmpdir(srcdir, hook, config, verbose) as (
-        distinfo_dir,
-        tmp_path,
+    with (
+        build_out_tmpdir(srcdir, hook, config, verbose) as (
+            distinfo_dir, tmp_path,
+        ),
     ):
         if distinfo_dir:
             metadata_path_src = tmp_path / distinfo_dir / metadata_filename
-            # Python 3.8 syntax
-            with metadata_path_src.open(
-                mode="rb"
-            ) as fsrc, metadata_path_dest.open(mode="wb") as fdst:
+            with (
+                metadata_path_src.open(mode="rb") as fsrc,
+                metadata_path_dest.open(mode="wb") as fdst,
+            ):
                 shutil.copyfileobj(fsrc, fdst)
             return metadata_filename
 
     # backend doesn't support optional prepare_metadata_for_build_wheel
     # fallback to build_wheel
     hook = "build_wheel"
     logger.info("Fallback to building metadata with %s", hook)
-    with build_out_tmpdir(srcdir, hook, config, verbose) as (
-        wheel_filename,
-        tmp_path,
+    with (
+        build_out_tmpdir(srcdir, hook, config, verbose) as (
+            wheel_filename,
+            tmp_path,
+        ),
     ):
         wheel_path = tmp_path / wheel_filename
         with WheelFile(wheel_path) as whl:
             metadata_path_src = whl.dist_info / metadata_filename
-            if sys.version_info > (3, 9):
-                # Python3.9: zipfile.Path.open opens in text mode by default
-                mode = "rb"
-            else:
-                # Python3.8: zipfile.Path.open supports only binary mode
-                mode = "r"
-            # Python 3.8 syntax
-            with metadata_path_src.open(
-                mode=mode
-            ) as fsrc, metadata_path_dest.open(mode="wb") as fdst:
+            with (
+                metadata_path_src.open(mode="rb") as fsrc,
+                metadata_path_dest.open(mode="wb") as fdst,
+            ):
                 shutil.copyfileobj(fsrc, fdst)
     return metadata_filename

src/pyproject_installer/lib/entry_points.py

@@ -1,7 +1,6 @@
 def parse_entry_points(distr, group):
     """
     Compat only.
-    - module and attr attributes of ep are available since Python 3.9
     - "selectable" entry points were introduced in Python 3.10
     """
     distr_eps = distr.entry_points
@@ -13,18 +12,4 @@ def parse_entry_points(distr, group):
     else:
         eps = distr_eps.select(group=group)
 
-    for ep in eps:
-        try:
-            # module is available since Python 3.9
-            ep_module = ep.module
-        except AttributeError:
-            ep_match = ep.pattern.match(ep.value)
-            ep_module = ep_match.group("module")
-
-        try:
-            # attr is available since Python 3.9
-            ep_attr = ep.attr
-        except AttributeError:
-            ep_attr = ep_match.group("attr")
-
-        yield (ep.name, ep.value, ep_module, ep_attr)
+    yield from ((ep.name, ep.value, ep.module, ep.attr) for ep in eps)

src/pyproject_installer/lib/wheel.py

@@ -151,16 +151,10 @@ def validate_record(self):
         record_path = self.dist_info / "RECORD"
         recorded_files = set()
 
-        if sys.version_info > (3, 9):
-            # since Python3.9 zipfile.Path.open opens in text mode by default
-            mode = "rb"
-        else:
-            # while Python3.8 zipfile.Path.open supports only binary mode
-            mode = "r"
-
-        with record_path.open(mode=mode) as csvbf, TextIOWrapper(
-            csvbf, encoding="utf-8", newline=""
-        ) as csvf:
+        with (
+            record_path.open(mode="rb") as csvbf,
+            TextIOWrapper(csvbf, encoding="utf-8", newline="") as csvf,
+        ):
             reader = csv.reader(csvf)
             for row in reader:
                 # path, hash and size

src/pyproject_installer/run_cmd/_run_env.py

@@ -33,19 +33,13 @@ def __init__(self, wheel):
             "clear": True,
             "upgrade": False,
             "with_pip": False,
+            "upgrade_deps": False,
         }
-        if sys.version_info > (3, 9):
-            # New in version 3.9: Added the upgrade_deps parameter
-            venv_kwargs["upgrade_deps"] = False
         super().__init__(**venv_kwargs)
 
     def ensure_directories(self, *args, **kwargs):
         # save context for reusage
         self.context = super().ensure_directories(*args, **kwargs)
-        # env_exec_cmd requires Python3.9+ (https://bugs.python.org/issue45337),
-        # for non-windows systems: context.env_exec_cmd = context.env_exe
-        if not hasattr(self.context, "env_exec_cmd"):
-            self.context.env_exec_cmd = self.context.env_exe
         return self.context
 
     def install_console_scripts(self, context):

tests/conftest.py

@@ -75,9 +75,10 @@ def update_record(self):
             self.record = ws.getvalue()
 
     def drop_from_record(self, file):
-        with StringIO(self.record, newline="") as rs, StringIO(
-            newline=""
-        ) as ws:
+        with (
+            StringIO(self.record, newline="") as rs,
+            StringIO(newline="") as ws,
+        ):
             reader = csv.reader(rs)
             writer = csv.writer(ws, lineterminator="\n")
             for row in reader:

tests/integration/conftest.py

@@ -21,10 +21,6 @@ def __init__(self, *args, **kwargs):
     def ensure_directories(self, *args, **kwargs):
         # save context for reusage
         self.context = super().ensure_directories(*args, **kwargs)
-        # env_exec_cmd requires Python3.9+ (https://bugs.python.org/issue45337),
-        # for non-windows systems: context.env_exec_cmd = context.env_exe
-        if not hasattr(self.context, "env_exec_cmd"):
-            self.context.env_exec_cmd = self.context.env_exe
         return self.context