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manifest: delay import of `typing.ByteString` for py 3.14 support (issue6940)...
manifest: delay import of `typing.ByteString` for py 3.14 support (issue6940) Since Python 2.7 and 3.5, `typing.ByteString` was defined as an alias for `bytes | bytearray | memoryview`, and `bytes` was also accepted as a shorthand for this, so we have `bytes` sprinkled all over the codebase. But then PEP-688 reversed all of that by deprecating `typing.ByteString` and its successor `collections.abc.ByteString` in Python 3.12 (as well as the `bytes` shorthand)[1], and removing it completely in Python 3.14. That leaves us with a couple of problems, namely defining something useful that spans py3.8-py3.13 and keeps pytype happy, and finding all of the instances where `bytes` doesn't really mean `bytes`. The current successor to all of this is `collections.abc.Buffer` in Python 3.12 (or `typing_extensions.Buffer` in previous versions). However, the current CI does type checking using Python 3.11 (so the former is not avaiable), and pytype has issues with importing `typing_extensions.Buffer`[2]. The good news is we don't need to deal with this mess immediately, since the type annotation evaluation is delayed to the type checking phase, and we're making no effort at supporting it in all supported versions of Python. So by delaying the import of this particular symbol, we can still use it for type checking purposes, but can start assessing Python 3.14 problems without doing a lot of extra work. Putting this on stable will allow people interested in 3.14 to work on it 4-5 extra months earlier (and apparently there's some interest). [1] https://peps.python.org/pep-0688/#no-special-meaning-for-bytes [2] https://github.com/google/pytype/issues/1772

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setup.py
119 lines | 3.3 KiB | text/x-python | PythonLexer
#!/usr/bin/env python
# Copyright (c) 2016-present, Gregory Szorc
# All rights reserved.
#
# This software may be modified and distributed under the terms
# of the BSD license. See the LICENSE file for details.
from distutils.version import LooseVersion
import os
import sys
from setuptools import setup
# Need change in 1.10 for ffi.from_buffer() to handle all buffer types
# (like memoryview).
# Need feature in 1.11 for ffi.gc() to declare size of objects so we avoid
# garbage collection pitfalls.
MINIMUM_CFFI_VERSION = "1.11"
try:
import cffi
# PyPy (and possibly other distros) have CFFI distributed as part of
# them. The install_requires for CFFI below won't work. We need to sniff
# out the CFFI version here and reject CFFI if it is too old.
cffi_version = LooseVersion(cffi.__version__)
if cffi_version < LooseVersion(MINIMUM_CFFI_VERSION):
print(
"CFFI 1.11 or newer required (%s found); "
"not building CFFI backend" % cffi_version,
file=sys.stderr,
)
cffi = None
except ImportError:
cffi = None
import setup_zstd
SUPPORT_LEGACY = False
SYSTEM_ZSTD = False
WARNINGS_AS_ERRORS = False
if os.environ.get("ZSTD_WARNINGS_AS_ERRORS", ""):
WARNINGS_AS_ERRORS = True
if "--legacy" in sys.argv:
SUPPORT_LEGACY = True
sys.argv.remove("--legacy")
if "--system-zstd" in sys.argv:
SYSTEM_ZSTD = True
sys.argv.remove("--system-zstd")
if "--warnings-as-errors" in sys.argv:
WARNINGS_AS_ERRORS = True
sys.argv.remove("--warning-as-errors")
# Code for obtaining the Extension instance is in its own module to
# facilitate reuse in other projects.
extensions = [
setup_zstd.get_c_extension(
name="zstd",
support_legacy=SUPPORT_LEGACY,
system_zstd=SYSTEM_ZSTD,
warnings_as_errors=WARNINGS_AS_ERRORS,
),
]
install_requires = []
if cffi:
import make_cffi
extensions.append(make_cffi.ffi.distutils_extension())
install_requires.append("cffi>=%s" % MINIMUM_CFFI_VERSION)
version = None
with open("c-ext/python-zstandard.h", "r") as fh:
for line in fh:
if not line.startswith("#define PYTHON_ZSTANDARD_VERSION"):
continue
version = line.split()[2][1:-1]
break
if not version:
raise Exception(
"could not resolve package version; " "this should never happen"
)
setup(
name="zstandard",
version=version,
description="Zstandard bindings for Python",
long_description=open("README.rst", "r").read(),
url="https://github.com/indygreg/python-zstandard",
author="Gregory Szorc",
author_email="gregory.szorc@gmail.com",
license="BSD",
classifiers=[
"Development Status :: 4 - Beta",
"Intended Audience :: Developers",
"License :: OSI Approved :: BSD License",
"Programming Language :: C",
"Programming Language :: Python :: 2.7",
"Programming Language :: Python :: 3.5",
"Programming Language :: Python :: 3.6",
"Programming Language :: Python :: 3.7",
"Programming Language :: Python :: 3.8",
],
keywords="zstandard zstd compression",
packages=["zstandard"],
ext_modules=extensions,
test_suite="tests",
install_requires=install_requires,
tests_require=["hypothesis"],
)