Source code for packaging.tags

# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.

from __future__ import absolute_import

import distutils.util

try:
    from importlib.machinery import EXTENSION_SUFFIXES
except ImportError:  # pragma: no cover
    import imp

    EXTENSION_SUFFIXES = [x[0] for x in imp.get_suffixes()]
    del imp
import collections
import logging
import os
import platform
import re
import struct
import sys
import sysconfig
import warnings

from ._typing import TYPE_CHECKING, cast

if TYPE_CHECKING:  # pragma: no cover
    from typing import (
        Dict,
        FrozenSet,
        IO,
        Iterable,
        Iterator,
        List,
        Optional,
        Sequence,
        Tuple,
        Union,
    )

    PythonVersion = Sequence[int]
    MacVersion = Tuple[int, int]
    GlibcVersion = Tuple[int, int]


logger = logging.getLogger(__name__)

INTERPRETER_SHORT_NAMES = {
    "python": "py",  # Generic.
    "cpython": "cp",
    "pypy": "pp",
    "ironpython": "ip",
    "jython": "jy",
}  # type: Dict[str, str]


_32_BIT_INTERPRETER = sys.maxsize <= 2 ** 32


_LEGACY_MANYLINUX_MAP = {
    # CentOS 7 w/ glibc 2.17 (PEP 599)
    (2, 17): "manylinux2014",
    # CentOS 6 w/ glibc 2.12 (PEP 571)
    (2, 12): "manylinux2010",
    # CentOS 5 w/ glibc 2.5 (PEP 513)
    (2, 5): "manylinux1",
}

# If glibc ever changes its major version, we need to know what the last
# minor version was, so we can build the complete list of all versions.
# For now, guess what the highest minor version might be, assume it will
# be 50 for testing. Once this actually happens, update the dictionary
# with the actual value.
_LAST_GLIBC_MINOR = collections.defaultdict(lambda: 50)  # type: Dict[int, int]
glibcVersion = collections.namedtuple("Version", ["major", "minor"])


[docs]class Tag(object): """ A representation of the tag triple for a wheel. Instances are considered immutable and thus are hashable. Equality checking is also supported. """ __slots__ = ["_interpreter", "_abi", "_platform", "_hash"] def __init__(self, interpreter, abi, platform): # type: (str, str, str) -> None self._interpreter = interpreter.lower() self._abi = abi.lower() self._platform = platform.lower() # The __hash__ of every single element in a Set[Tag] will be evaluated each time # that a set calls its `.disjoint()` method, which may be called hundreds of # times when scanning a page of links for packages with tags matching that # Set[Tag]. Pre-computing the value here produces significant speedups for # downstream consumers. self._hash = hash((self._interpreter, self._abi, self._platform)) @property def interpreter(self): # type: () -> str return self._interpreter @property def abi(self): # type: () -> str return self._abi @property def platform(self): # type: () -> str return self._platform def __eq__(self, other): # type: (object) -> bool if not isinstance(other, Tag): return NotImplemented return ( (self.platform == other.platform) and (self.abi == other.abi) and (self.interpreter == other.interpreter) ) def __hash__(self): # type: () -> int return self._hash def __str__(self): # type: () -> str return "{}-{}-{}".format(self._interpreter, self._abi, self._platform) def __repr__(self): # type: () -> str return "<{self} @ {self_id}>".format(self=self, self_id=id(self))
[docs]def parse_tag(tag): # type: (str) -> FrozenSet[Tag] """ Parses the provided tag (e.g. `py3-none-any`) into a frozenset of Tag instances. Returning a set is required due to the possibility that the tag is a compressed tag set. """ tags = set() interpreters, abis, platforms = tag.split("-") for interpreter in interpreters.split("."): for abi in abis.split("."): for platform_ in platforms.split("."): tags.add(Tag(interpreter, abi, platform_)) return frozenset(tags)
def _warn_keyword_parameter(func_name, kwargs): # type: (str, Dict[str, bool]) -> bool """ Backwards-compatibility with Python 2.7 to allow treating 'warn' as keyword-only. """ if not kwargs: return False elif len(kwargs) > 1 or "warn" not in kwargs: kwargs.pop("warn", None) arg = next(iter(kwargs.keys())) raise TypeError( "{}() got an unexpected keyword argument {!r}".format(func_name, arg) ) return kwargs["warn"] def _get_config_var(name, warn=False): # type: (str, bool) -> Union[int, str, None] value = sysconfig.get_config_var(name) if value is None and warn: logger.debug( "Config variable '%s' is unset, Python ABI tag may be incorrect", name ) return value def _normalize_string(string): # type: (str) -> str return string.replace(".", "_").replace("-", "_") def _abi3_applies(python_version): # type: (PythonVersion) -> bool """ Determine if the Python version supports abi3. PEP 384 was first implemented in Python 3.2. """ return len(python_version) > 1 and tuple(python_version) >= (3, 2) def _cpython_abis(py_version, warn=False): # type: (PythonVersion, bool) -> List[str] py_version = tuple(py_version) # To allow for version comparison. abis = [] version = _version_nodot(py_version[:2]) debug = pymalloc = ucs4 = "" with_debug = _get_config_var("Py_DEBUG", warn) has_refcount = hasattr(sys, "gettotalrefcount") # Windows doesn't set Py_DEBUG, so checking for support of debug-compiled # extension modules is the best option. # https://github.com/pypa/pip/issues/3383#issuecomment-173267692 has_ext = "_d.pyd" in EXTENSION_SUFFIXES if with_debug or (with_debug is None and (has_refcount or has_ext)): debug = "d" if py_version < (3, 8): with_pymalloc = _get_config_var("WITH_PYMALLOC", warn) if with_pymalloc or with_pymalloc is None: pymalloc = "m" if py_version < (3, 3): unicode_size = _get_config_var("Py_UNICODE_SIZE", warn) if unicode_size == 4 or ( unicode_size is None and sys.maxunicode == 0x10FFFF ): ucs4 = "u" elif debug: # Debug builds can also load "normal" extension modules. # We can also assume no UCS-4 or pymalloc requirement. abis.append("cp{version}".format(version=version)) abis.insert( 0, "cp{version}{debug}{pymalloc}{ucs4}".format( version=version, debug=debug, pymalloc=pymalloc, ucs4=ucs4 ), ) return abis
[docs]def cpython_tags( python_version=None, # type: Optional[PythonVersion] abis=None, # type: Optional[Iterable[str]] platforms=None, # type: Optional[Iterable[str]] **kwargs # type: bool ): # type: (...) -> Iterator[Tag] """ Yields the tags for a CPython interpreter. The tags consist of: - cp<python_version>-<abi>-<platform> - cp<python_version>-abi3-<platform> - cp<python_version>-none-<platform> - cp<less than python_version>-abi3-<platform> # Older Python versions down to 3.2. If python_version only specifies a major version then user-provided ABIs and the 'none' ABItag will be used. If 'abi3' or 'none' are specified in 'abis' then they will be yielded at their normal position and not at the beginning. """ warn = _warn_keyword_parameter("cpython_tags", kwargs) if not python_version: python_version = sys.version_info[:2] interpreter = "cp{}".format(_version_nodot(python_version[:2])) if abis is None: if len(python_version) > 1: abis = _cpython_abis(python_version, warn) else: abis = [] abis = list(abis) # 'abi3' and 'none' are explicitly handled later. for explicit_abi in ("abi3", "none"): try: abis.remove(explicit_abi) except ValueError: pass platforms = list(platforms or _platform_tags()) for abi in abis: for platform_ in platforms: yield Tag(interpreter, abi, platform_) if _abi3_applies(python_version): for tag in (Tag(interpreter, "abi3", platform_) for platform_ in platforms): yield tag for tag in (Tag(interpreter, "none", platform_) for platform_ in platforms): yield tag if _abi3_applies(python_version): for minor_version in range(python_version[1] - 1, 1, -1): for platform_ in platforms: interpreter = "cp{version}".format( version=_version_nodot((python_version[0], minor_version)) ) yield Tag(interpreter, "abi3", platform_)
def _generic_abi(): # type: () -> Iterator[str] abi = sysconfig.get_config_var("SOABI") if abi: yield _normalize_string(abi)
[docs]def generic_tags( interpreter=None, # type: Optional[str] abis=None, # type: Optional[Iterable[str]] platforms=None, # type: Optional[Iterable[str]] **kwargs # type: bool ): # type: (...) -> Iterator[Tag] """ Yields the tags for a generic interpreter. The tags consist of: - <interpreter>-<abi>-<platform> The "none" ABI will be added if it was not explicitly provided. """ warn = _warn_keyword_parameter("generic_tags", kwargs) if not interpreter: interp_name = interpreter_name() interp_version = interpreter_version(warn=warn) interpreter = "".join([interp_name, interp_version]) if abis is None: abis = _generic_abi() platforms = list(platforms or _platform_tags()) abis = list(abis) if "none" not in abis: abis.append("none") for abi in abis: for platform_ in platforms: yield Tag(interpreter, abi, platform_)
def _py_interpreter_range(py_version): # type: (PythonVersion) -> Iterator[str] """ Yields Python versions in descending order. After the latest version, the major-only version will be yielded, and then all previous versions of that major version. """ if len(py_version) > 1: yield "py{version}".format(version=_version_nodot(py_version[:2])) yield "py{major}".format(major=py_version[0]) if len(py_version) > 1: for minor in range(py_version[1] - 1, -1, -1): yield "py{version}".format(version=_version_nodot((py_version[0], minor)))
[docs]def compatible_tags( python_version=None, # type: Optional[PythonVersion] interpreter=None, # type: Optional[str] platforms=None, # type: Optional[Iterable[str]] ): # type: (...) -> Iterator[Tag] """ Yields the sequence of tags that are compatible with a specific version of Python. The tags consist of: - py*-none-<platform> - <interpreter>-none-any # ... if `interpreter` is provided. - py*-none-any """ if not python_version: python_version = sys.version_info[:2] platforms = list(platforms or _platform_tags()) for version in _py_interpreter_range(python_version): for platform_ in platforms: yield Tag(version, "none", platform_) if interpreter: yield Tag(interpreter, "none", "any") for version in _py_interpreter_range(python_version): yield Tag(version, "none", "any")
def _mac_arch(arch, is_32bit=_32_BIT_INTERPRETER): # type: (str, bool) -> str if not is_32bit: return arch if arch.startswith("ppc"): return "ppc" return "i386" def _mac_binary_formats(version, cpu_arch): # type: (MacVersion, str) -> List[str] formats = [cpu_arch] if cpu_arch == "x86_64": if version < (10, 4): return [] formats.extend(["intel", "fat64", "fat32"]) elif cpu_arch == "i386": if version < (10, 4): return [] formats.extend(["intel", "fat32", "fat"]) elif cpu_arch == "ppc64": # TODO: Need to care about 32-bit PPC for ppc64 through 10.2? if version > (10, 5) or version < (10, 4): return [] formats.append("fat64") elif cpu_arch == "ppc": if version > (10, 6): return [] formats.extend(["fat32", "fat"]) if cpu_arch in {"arm64", "x86_64"}: formats.append("universal2") if cpu_arch in {"x86_64", "i386", "ppc64", "ppc", "intel"}: formats.append("universal") return formats
[docs]def mac_platforms(version=None, arch=None): # type: (Optional[MacVersion], Optional[str]) -> Iterator[str] """ Yields the platform tags for a macOS system. The `version` parameter is a two-item tuple specifying the macOS version to generate platform tags for. The `arch` parameter is the CPU architecture to generate platform tags for. Both parameters default to the appropriate value for the current system. """ version_str, _, cpu_arch = platform.mac_ver() # type: ignore if version is None: version = cast("MacVersion", tuple(map(int, version_str.split(".")[:2]))) else: version = version if arch is None: arch = _mac_arch(cpu_arch) else: arch = arch if (10, 0) <= version and version < (11, 0): # Prior to Mac OS 11, each yearly release of Mac OS bumped the # "minor" version number. The major version was always 10. for minor_version in range(version[1], -1, -1): compat_version = 10, minor_version binary_formats = _mac_binary_formats(compat_version, arch) for binary_format in binary_formats: yield "macosx_{major}_{minor}_{binary_format}".format( major=10, minor=minor_version, binary_format=binary_format ) if version >= (11, 0): # Starting with Mac OS 11, each yearly release bumps the major version # number. The minor versions are now the midyear updates. for major_version in range(version[0], 10, -1): compat_version = major_version, 0 binary_formats = _mac_binary_formats(compat_version, arch) for binary_format in binary_formats: yield "macosx_{major}_{minor}_{binary_format}".format( major=major_version, minor=0, binary_format=binary_format ) if version >= (11, 0) and arch == "x86_64": # Mac OS 11 on x86_64 is compatible with binaries from previous releases. # Arm64 support was introduced in 11.0, so no Arm binaries from previous # releases exist. for minor_version in range(16, 3, -1): compat_version = 10, minor_version binary_formats = _mac_binary_formats(compat_version, arch) for binary_format in binary_formats: yield "macosx_{major}_{minor}_{binary_format}".format( major=compat_version[0], minor=compat_version[1], binary_format=binary_format, )
# From PEP 513, PEP 600 def _is_manylinux_compatible(name, arch, glibc_version): # type: (str, str, GlibcVersion) -> bool sys_glibc = _get_glibc_version() if sys_glibc < glibc_version: return False # Check for presence of _manylinux module. try: import _manylinux # noqa except ImportError: pass else: if hasattr(_manylinux, "manylinux_compatible"): result = _manylinux.manylinux_compatible( glibc_version[0], glibc_version[1], arch ) if result is not None: return bool(result) else: if glibc_version == (2, 5): if hasattr(_manylinux, "manylinux1_compatible"): return bool(_manylinux.manylinux1_compatible) if glibc_version == (2, 12): if hasattr(_manylinux, "manylinux2010_compatible"): return bool(_manylinux.manylinux2010_compatible) if glibc_version == (2, 17): if hasattr(_manylinux, "manylinux2014_compatible"): return bool(_manylinux.manylinux2014_compatible) return True def _glibc_version_string(): # type: () -> Optional[str] # Returns glibc version string, or None if not using glibc. return _glibc_version_string_confstr() or _glibc_version_string_ctypes() def _glibc_version_string_confstr(): # type: () -> Optional[str] """ Primary implementation of glibc_version_string using os.confstr. """ # os.confstr is quite a bit faster than ctypes.DLL. It's also less likely # to be broken or missing. This strategy is used in the standard library # platform module. # https://github.com/python/cpython/blob/fcf1d003bf4f0100c9d0921ff3d70e1127ca1b71/Lib/platform.py#L175-L183 try: # os.confstr("CS_GNU_LIBC_VERSION") returns a string like "glibc 2.17". version_string = os.confstr( # type: ignore[attr-defined] # noqa: F821 "CS_GNU_LIBC_VERSION" ) assert version_string is not None _, version = version_string.split() # type: Tuple[str, str] except (AssertionError, AttributeError, OSError, ValueError): # os.confstr() or CS_GNU_LIBC_VERSION not available (or a bad value)... return None return version def _glibc_version_string_ctypes(): # type: () -> Optional[str] """ Fallback implementation of glibc_version_string using ctypes. """ try: import ctypes except ImportError: return None # ctypes.CDLL(None) internally calls dlopen(NULL), and as the dlopen # manpage says, "If filename is NULL, then the returned handle is for the # main program". This way we can let the linker do the work to figure out # which libc our process is actually using. # # We must also handle the special case where the executable is not a # dynamically linked executable. This can occur when using musl libc, # for example. In this situation, dlopen() will error, leading to an # OSError. Interestingly, at least in the case of musl, there is no # errno set on the OSError. The single string argument used to construct # OSError comes from libc itself and is therefore not portable to # hard code here. In any case, failure to call dlopen() means we # can proceed, so we bail on our attempt. try: # Note: typeshed is wrong here so we are ignoring this line. process_namespace = ctypes.CDLL(None) # type: ignore except OSError: return None try: gnu_get_libc_version = process_namespace.gnu_get_libc_version except AttributeError: # Symbol doesn't exist -> therefore, we are not linked to # glibc. return None # Call gnu_get_libc_version, which returns a string like "2.5" gnu_get_libc_version.restype = ctypes.c_char_p version_str = gnu_get_libc_version() # type: str # py2 / py3 compatibility: if not isinstance(version_str, str): version_str = version_str.decode("ascii") return version_str def _parse_glibc_version(version_str): # type: (str) -> Tuple[int, int] # Parse glibc version. # # We use a regexp instead of str.split because we want to discard any # random junk that might come after the minor version -- this might happen # in patched/forked versions of glibc (e.g. Linaro's version of glibc # uses version strings like "2.20-2014.11"). See gh-3588. m = re.match(r"(?P<major>[0-9]+)\.(?P<minor>[0-9]+)", version_str) if not m: warnings.warn( "Expected glibc version with 2 components major.minor," " got: %s" % version_str, RuntimeWarning, ) return -1, -1 return (int(m.group("major")), int(m.group("minor"))) _glibc_version = [] # type: List[Tuple[int, int]] def _get_glibc_version(): # type: () -> Tuple[int, int] if _glibc_version: return _glibc_version[0] version_str = _glibc_version_string() if version_str is None: _glibc_version.append((-1, -1)) else: _glibc_version.append(_parse_glibc_version(version_str)) return _glibc_version[0] # Python does not provide platform information at sufficient granularity to # identify the architecture of the running executable in some cases, so we # determine it dynamically by reading the information from the running # process. This only applies on Linux, which uses the ELF format. class _ELFFileHeader(object): # https://en.wikipedia.org/wiki/Executable_and_Linkable_Format#File_header class _InvalidELFFileHeader(ValueError): """ An invalid ELF file header was found. """ ELF_MAGIC_NUMBER = 0x7F454C46 ELFCLASS32 = 1 ELFCLASS64 = 2 ELFDATA2LSB = 1 ELFDATA2MSB = 2 EM_386 = 3 EM_S390 = 22 EM_ARM = 40 EM_X86_64 = 62 EF_ARM_ABIMASK = 0xFF000000 EF_ARM_ABI_VER5 = 0x05000000 EF_ARM_ABI_FLOAT_HARD = 0x00000400 def __init__(self, file): # type: (IO[bytes]) -> None def unpack(fmt): # type: (str) -> int try: (result,) = struct.unpack( fmt, file.read(struct.calcsize(fmt)) ) # type: (int, ) except struct.error: raise _ELFFileHeader._InvalidELFFileHeader() return result self.e_ident_magic = unpack(">I") if self.e_ident_magic != self.ELF_MAGIC_NUMBER: raise _ELFFileHeader._InvalidELFFileHeader() self.e_ident_class = unpack("B") if self.e_ident_class not in {self.ELFCLASS32, self.ELFCLASS64}: raise _ELFFileHeader._InvalidELFFileHeader() self.e_ident_data = unpack("B") if self.e_ident_data not in {self.ELFDATA2LSB, self.ELFDATA2MSB}: raise _ELFFileHeader._InvalidELFFileHeader() self.e_ident_version = unpack("B") self.e_ident_osabi = unpack("B") self.e_ident_abiversion = unpack("B") self.e_ident_pad = file.read(7) format_h = "<H" if self.e_ident_data == self.ELFDATA2LSB else ">H" format_i = "<I" if self.e_ident_data == self.ELFDATA2LSB else ">I" format_q = "<Q" if self.e_ident_data == self.ELFDATA2LSB else ">Q" format_p = format_i if self.e_ident_class == self.ELFCLASS32 else format_q self.e_type = unpack(format_h) self.e_machine = unpack(format_h) self.e_version = unpack(format_i) self.e_entry = unpack(format_p) self.e_phoff = unpack(format_p) self.e_shoff = unpack(format_p) self.e_flags = unpack(format_i) self.e_ehsize = unpack(format_h) self.e_phentsize = unpack(format_h) self.e_phnum = unpack(format_h) self.e_shentsize = unpack(format_h) self.e_shnum = unpack(format_h) self.e_shstrndx = unpack(format_h) def _get_elf_header(): # type: () -> Optional[_ELFFileHeader] try: with open(sys.executable, "rb") as f: elf_header = _ELFFileHeader(f) except (IOError, OSError, TypeError, _ELFFileHeader._InvalidELFFileHeader): return None return elf_header def _is_linux_armhf(): # type: () -> bool # hard-float ABI can be detected from the ELF header of the running # process # https://static.docs.arm.com/ihi0044/g/aaelf32.pdf elf_header = _get_elf_header() if elf_header is None: return False result = elf_header.e_ident_class == elf_header.ELFCLASS32 result &= elf_header.e_ident_data == elf_header.ELFDATA2LSB result &= elf_header.e_machine == elf_header.EM_ARM result &= ( elf_header.e_flags & elf_header.EF_ARM_ABIMASK ) == elf_header.EF_ARM_ABI_VER5 result &= ( elf_header.e_flags & elf_header.EF_ARM_ABI_FLOAT_HARD ) == elf_header.EF_ARM_ABI_FLOAT_HARD return result def _is_linux_i686(): # type: () -> bool elf_header = _get_elf_header() if elf_header is None: return False result = elf_header.e_ident_class == elf_header.ELFCLASS32 result &= elf_header.e_ident_data == elf_header.ELFDATA2LSB result &= elf_header.e_machine == elf_header.EM_386 return result def _have_compatible_manylinux_abi(arch): # type: (str) -> bool if arch == "armv7l": return _is_linux_armhf() if arch == "i686": return _is_linux_i686() return arch in {"x86_64", "aarch64", "ppc64", "ppc64le", "s390x"} def _manylinux_tags(linux, arch): # type: (str, str) -> Iterator[str] # Oldest glibc to be supported regardless of architecture is (2, 17). too_old_glibc2 = glibcVersion(2, 16) if arch in {"x86_64", "i686"}: # On x86/i686 also oldest glibc to be supported is (2, 5). too_old_glibc2 = glibcVersion(2, 4) current_glibc = glibcVersion(*_get_glibc_version()) glibc_max_list = [current_glibc] # We can assume compatibility across glibc major versions. # https://sourceware.org/bugzilla/show_bug.cgi?id=24636 # # Build a list of maximum glibc versions so that we can # output the canonical list of all glibc from current_glibc # down to too_old_glibc2, including all intermediary versions. for glibc_major in range(current_glibc.major - 1, 1, -1): glibc_max_list.append(glibcVersion(glibc_major, _LAST_GLIBC_MINOR[glibc_major])) for glibc_max in glibc_max_list: if glibc_max.major == too_old_glibc2.major: min_minor = too_old_glibc2.minor else: # For other glibc major versions oldest supported is (x, 0). min_minor = -1 for glibc_minor in range(glibc_max.minor, min_minor, -1): glibc_version = (glibc_max.major, glibc_minor) tag = "manylinux_{}_{}".format(*glibc_version) if _is_manylinux_compatible(tag, arch, glibc_version): yield linux.replace("linux", tag) # Handle the legacy manylinux1, manylinux2010, manylinux2014 tags. if glibc_version in _LEGACY_MANYLINUX_MAP: legacy_tag = _LEGACY_MANYLINUX_MAP[glibc_version] if _is_manylinux_compatible(legacy_tag, arch, glibc_version): yield linux.replace("linux", legacy_tag) def _linux_platforms(is_32bit=_32_BIT_INTERPRETER): # type: (bool) -> Iterator[str] linux = _normalize_string(distutils.util.get_platform()) if is_32bit: if linux == "linux_x86_64": linux = "linux_i686" elif linux == "linux_aarch64": linux = "linux_armv7l" _, arch = linux.split("_", 1) if _have_compatible_manylinux_abi(arch): for tag in _manylinux_tags(linux, arch): yield tag yield linux def _generic_platforms(): # type: () -> Iterator[str] yield _normalize_string(distutils.util.get_platform()) def _platform_tags(): # type: () -> Iterator[str] """ Provides the platform tags for this installation. """ if platform.system() == "Darwin": return mac_platforms() elif platform.system() == "Linux": return _linux_platforms() else: return _generic_platforms()
[docs]def interpreter_name(): # type: () -> str """ Returns the name of the running interpreter. """ try: name = sys.implementation.name # type: ignore except AttributeError: # pragma: no cover # Python 2.7 compatibility. name = platform.python_implementation().lower() return INTERPRETER_SHORT_NAMES.get(name) or name
[docs]def interpreter_version(**kwargs): # type: (bool) -> str """ Returns the version of the running interpreter. """ warn = _warn_keyword_parameter("interpreter_version", kwargs) version = _get_config_var("py_version_nodot", warn=warn) if version: version = str(version) else: version = _version_nodot(sys.version_info[:2]) return version
def _version_nodot(version): # type: (PythonVersion) -> str return "".join(map(str, version))
[docs]def sys_tags(**kwargs): # type: (bool) -> Iterator[Tag] """ Returns the sequence of tag triples for the running interpreter. The order of the sequence corresponds to priority order for the interpreter, from most to least important. """ warn = _warn_keyword_parameter("sys_tags", kwargs) interp_name = interpreter_name() if interp_name == "cp": for tag in cpython_tags(warn=warn): yield tag else: for tag in generic_tags(): yield tag for tag in compatible_tags(): yield tag