"""Access to Python's configuration information."""

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import os

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import sys

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from os.path import pardir, realpath

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__all__ = [

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'get_config_h_filename',

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'get_config_var',

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'get_config_vars',

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'get_makefile_filename',

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'get_path',

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'get_path_names',

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'get_paths',

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'get_platform',

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'get_python_version',

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'get_scheme_names',

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'parse_config_h',

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]

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# Keys for get_config_var() that are never converted to Python integers.

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_ALWAYS_STR = {

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'MACOSX_DEPLOYMENT_TARGET',

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}

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_INSTALL_SCHEMES = {

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'posix_prefix': {

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'stdlib': '{installed_base}/lib64/python{py_version_short}',

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'platstdlib': '{platbase}/lib64/python{py_version_short}',

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'purelib': '{base}/lib/python{py_version_short}/site-packages',

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'platlib': '{platbase}/lib64/python{py_version_short}/site-packages',

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'include':

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'{installed_base}/include/python{py_version_short}{abiflags}',

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'platinclude':

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'{installed_platbase}/include/python{py_version_short}{abiflags}',

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'scripts': '{base}/bin',

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'data': '{base}',

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},

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'posix_home': {

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'stdlib': '{installed_base}/lib/python',

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'platstdlib': '{base}/lib/python',

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'purelib': '{base}/lib/python',

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'platlib': '{base}/lib/python',

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'include': '{installed_base}/include/python',

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'platinclude': '{installed_base}/include/python',

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'scripts': '{base}/bin',

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'data': '{base}',

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},

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'nt': {

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'stdlib': '{installed_base}/Lib',

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'platstdlib': '{base}/Lib',

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'purelib': '{base}/Lib/site-packages',

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'platlib': '{base}/Lib/site-packages',

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'include': '{installed_base}/Include',

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'platinclude': '{installed_base}/Include',

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'scripts': '{base}/Scripts',

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'data': '{base}',

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},

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# NOTE: When modifying "purelib" scheme, update site._get_path() too.

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'nt_user': {

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'stdlib': '{userbase}/Python{py_version_nodot}',

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'platstdlib': '{userbase}/Python{py_version_nodot}',

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'purelib': '{userbase}/Python{py_version_nodot}/site-packages',

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'platlib': '{userbase}/Python{py_version_nodot}/site-packages',

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'include': '{userbase}/Python{py_version_nodot}/Include',

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'scripts': '{userbase}/Python{py_version_nodot}/Scripts',

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'data': '{userbase}',

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},

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'posix_user': {

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'stdlib': '{userbase}/lib64/python{py_version_short}',

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'platstdlib': '{userbase}/lib64/python{py_version_short}',

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'purelib': '{userbase}/lib/python{py_version_short}/site-packages',

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'platlib': '{userbase}/lib64/python{py_version_short}/site-packages',

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'include': '{userbase}/include/python{py_version_short}',

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'scripts': '{userbase}/bin',

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'data': '{userbase}',

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},

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'osx_framework_user': {

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'stdlib': '{userbase}/lib/python',

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'platstdlib': '{userbase}/lib/python',

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'purelib': '{userbase}/lib/python/site-packages',

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'platlib': '{userbase}/lib/python/site-packages',

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'include': '{userbase}/include',

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'scripts': '{userbase}/bin',

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'data': '{userbase}',

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},

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}

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_SCHEME_KEYS = ('stdlib', 'platstdlib', 'purelib', 'platlib', 'include',

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'scripts', 'data')

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# FIXME don't rely on sys.version here, its format is an implementation detail

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# of CPython, use sys.version_info or sys.hexversion

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_PY_VERSION = sys.version.split()[0]

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_PY_VERSION_SHORT = '%d.%d' % sys.version_info[:2]

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_PY_VERSION_SHORT_NO_DOT = '%d%d' % sys.version_info[:2]

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_PREFIX = os.path.normpath(sys.prefix)

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_BASE_PREFIX = os.path.normpath(sys.base_prefix)

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_EXEC_PREFIX = os.path.normpath(sys.exec_prefix)

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_BASE_EXEC_PREFIX = os.path.normpath(sys.base_exec_prefix)

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_CONFIG_VARS = None

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_USER_BASE = None

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def _safe_realpath(path):

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try:

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return realpath(path)

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except OSError:

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return path

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if sys.executable:

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_PROJECT_BASE = os.path.dirname(_safe_realpath(sys.executable))

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else:

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# sys.executable can be empty if argv[0] has been changed and Python is

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# unable to retrieve the real program name

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_PROJECT_BASE = _safe_realpath(os.getcwd())

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if (os.name == 'nt' and

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_PROJECT_BASE.lower().endswith(('\\pcbuild\\win32', '\\pcbuild\\amd64'))):

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_PROJECT_BASE = _safe_realpath(os.path.join(_PROJECT_BASE, pardir, pardir))

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# set for cross builds

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if "_PYTHON_PROJECT_BASE" in os.environ:

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_PROJECT_BASE = _safe_realpath(os.environ["_PYTHON_PROJECT_BASE"])

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def _is_python_source_dir(d):

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for fn in ("Setup", "Setup.local"):

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if os.path.isfile(os.path.join(d, "Modules", fn)):

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return True

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return False

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_sys_home = getattr(sys, '_home', None)

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if os.name == 'nt':

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def _fix_pcbuild(d):

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if d and os.path.normcase(d).startswith(

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os.path.normcase(os.path.join(_PREFIX, "PCbuild"))):

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return _PREFIX

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return d

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_PROJECT_BASE = _fix_pcbuild(_PROJECT_BASE)

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_sys_home = _fix_pcbuild(_sys_home)

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def is_python_build(check_home=False):

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if check_home and _sys_home:

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return _is_python_source_dir(_sys_home)

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return _is_python_source_dir(_PROJECT_BASE)

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_PYTHON_BUILD = is_python_build(True)

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if _PYTHON_BUILD:

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for scheme in ('posix_prefix', 'posix_home'):

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_INSTALL_SCHEMES[scheme]['include'] = '{srcdir}/Include'

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_INSTALL_SCHEMES[scheme]['platinclude'] = '{projectbase}/.'

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def _subst_vars(s, local_vars):

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try:

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return s.format(**local_vars)

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except KeyError:

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try:

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return s.format(**os.environ)

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except KeyError as var:

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raise AttributeError('{%s}' % var) from None

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def _extend_dict(target_dict, other_dict):

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target_keys = target_dict.keys()

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for key, value in other_dict.items():

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if key in target_keys:

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continue

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target_dict[key] = value

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def _expand_vars(scheme, vars):

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res = {}

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if vars is None:

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vars = {}

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_extend_dict(vars, get_config_vars())

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for key, value in _INSTALL_SCHEMES[scheme].items():

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if os.name in ('posix', 'nt'):

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value = os.path.expanduser(value)

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res[key] = os.path.normpath(_subst_vars(value, vars))

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return res

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def _get_default_scheme():

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if os.name == 'posix':

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# the default scheme for posix is posix_prefix

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return 'posix_prefix'

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return os.name

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# NOTE: site.py has copy of this function.

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# Sync it when modify this function.

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def _getuserbase():

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env_base = os.environ.get("PYTHONUSERBASE", None)

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if env_base:

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return env_base

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def joinuser(*args):

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return os.path.expanduser(os.path.join(*args))

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if os.name == "nt":

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base = os.environ.get("APPDATA") or "~"

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return joinuser(base, "Python")

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if sys.platform == "darwin" and sys._framework:

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return joinuser("~", "Library", sys._framework,

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"%d.%d" % sys.version_info[:2])

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return joinuser("~", ".local")

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def _parse_makefile(filename, vars=None):

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"""Parse a Makefile-style file.

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A dictionary containing name/value pairs is returned. If an

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optional dictionary is passed in as the second argument, it is

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used instead of a new dictionary.

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"""

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# Regexes needed for parsing Makefile (and similar syntaxes,

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# like old-style Setup files).

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import re

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_variable_rx = re.compile(r"([a-zA-Z][a-zA-Z0-9_]+)\s*=\s*(.*)")

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_findvar1_rx = re.compile(r"\$\(([A-Za-z][A-Za-z0-9_]*)\)")

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_findvar2_rx = re.compile(r"\${([A-Za-z][A-Za-z0-9_]*)}")

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if vars is None:

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vars = {}

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done = {}

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notdone = {}

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with open(filename, errors="surrogateescape") as f:

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lines = f.readlines()

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for line in lines:

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if line.startswith('#') or line.strip() == '':

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continue

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m = _variable_rx.match(line)

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if m:

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n, v = m.group(1, 2)

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v = v.strip()

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# `$$' is a literal `$' in make

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tmpv = v.replace('$$', '')

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if "$" in tmpv:

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notdone[n] = v

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else:

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try:

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if n in _ALWAYS_STR:

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raise ValueError

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v = int(v)

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except ValueError:

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# insert literal `$'

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done[n] = v.replace('$$', '$')

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else:

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done[n] = v

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# do variable interpolation here

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variables = list(notdone.keys())

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# Variables with a 'PY_' prefix in the makefile. These need to

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# be made available without that prefix through sysconfig.

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# Special care is needed to ensure that variable expansion works, even

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# if the expansion uses the name without a prefix.

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renamed_variables = ('CFLAGS', 'LDFLAGS', 'CPPFLAGS')

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while len(variables) > 0:

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for name in tuple(variables):

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value = notdone[name]

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m1 = _findvar1_rx.search(value)

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m2 = _findvar2_rx.search(value)

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if m1 and m2:

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m = m1 if m1.start() < m2.start() else m2

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else:

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m = m1 if m1 else m2

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if m is not None:

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n = m.group(1)

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found = True

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if n in done:

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item = str(done[n])

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elif n in notdone:

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# get it on a subsequent round

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found = False

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elif n in os.environ:

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# do it like make: fall back to environment

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item = os.environ[n]

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elif n in renamed_variables:

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if (name.startswith('PY_') and

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name[3:] in renamed_variables):

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item = ""

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elif 'PY_' + n in notdone:

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found = False

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else:

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item = str(done['PY_' + n])

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else:

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done[n] = item = ""

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if found:

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after = value[m.end():]

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value = value[:m.start()] + item + after

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if "$" in after:

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notdone[name] = value

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else:

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try:

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if name in _ALWAYS_STR:

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raise ValueError

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value = int(value)

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except ValueError:

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done[name] = value.strip()

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else:

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done[name] = value

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variables.remove(name)

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if name.startswith('PY_') \

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and name[3:] in renamed_variables:

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name = name[3:]

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if name not in done:

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done[name] = value

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else:

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# bogus variable reference (e.g. "prefix=$/opt/python");

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# just drop it since we can't deal

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done[name] = value

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variables.remove(name)

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# strip spurious spaces

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for k, v in done.items():

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if isinstance(v, str):

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done[k] = v.strip()

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# save the results in the global dictionary

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vars.update(done)

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return vars

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def get_makefile_filename():

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"""Return the path of the Makefile."""

[343] Fix | Delete

if _PYTHON_BUILD:

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return os.path.join(_sys_home or _PROJECT_BASE, "Makefile")

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if hasattr(sys, 'abiflags'):

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config_dir_name = 'config-%s%s' % (_PY_VERSION_SHORT, sys.abiflags)

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else:

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config_dir_name = 'config'

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if hasattr(sys.implementation, '_multiarch'):

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config_dir_name += '-%s' % sys.implementation._multiarch

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return os.path.join(get_path('stdlib'), config_dir_name, 'Makefile')

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def _get_sysconfigdata_name():

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return os.environ.get('_PYTHON_SYSCONFIGDATA_NAME',

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'_sysconfigdata_{abi}_{platform}_{multiarch}'.format(

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abi=sys.abiflags,

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platform=sys.platform,

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multiarch=getattr(sys.implementation, '_multiarch', ''),

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))

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def _generate_posix_vars():

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"""Generate the Python module containing build-time variables."""

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import pprint

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vars = {}

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# load the installed Makefile:

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makefile = get_makefile_filename()

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try:

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_parse_makefile(makefile, vars)

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except OSError as e:

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msg = "invalid Python installation: unable to open %s" % makefile

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if hasattr(e, "strerror"):

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msg = msg + " (%s)" % e.strerror

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raise OSError(msg)

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# load the installed pyconfig.h:

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config_h = get_config_h_filename()

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try:

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with open(config_h) as f:

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parse_config_h(f, vars)

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except OSError as e:

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msg = "invalid Python installation: unable to open %s" % config_h

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if hasattr(e, "strerror"):

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msg = msg + " (%s)" % e.strerror

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raise OSError(msg)

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# On AIX, there are wrong paths to the linker scripts in the Makefile

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# -- these paths are relative to the Python source, but when installed

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# the scripts are in another directory.

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if _PYTHON_BUILD:

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vars['BLDSHARED'] = vars['LDSHARED']

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# There's a chicken-and-egg situation on OS X with regards to the

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# _sysconfigdata module after the changes introduced by #15298:

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# get_config_vars() is called by get_platform() as part of the

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# `make pybuilddir.txt` target -- which is a precursor to the

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# _sysconfigdata.py module being constructed. Unfortunately,

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# get_config_vars() eventually calls _init_posix(), which attempts

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# to import _sysconfigdata, which we won't have built yet. In order

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# for _init_posix() to work, if we're on Darwin, just mock up the

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# _sysconfigdata module manually and populate it with the build vars.

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# This is more than sufficient for ensuring the subsequent call to

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# get_platform() succeeds.

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name = _get_sysconfigdata_name()

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if 'darwin' in sys.platform:

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import types

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module = types.ModuleType(name)

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module.build_time_vars = vars

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sys.modules[name] = module

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pybuilddir = 'build/lib.%s-%s' % (get_platform(), _PY_VERSION_SHORT)

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if hasattr(sys, "gettotalrefcount"):

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pybuilddir += '-pydebug'

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os.makedirs(pybuilddir, exist_ok=True)

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destfile = os.path.join(pybuilddir, name + '.py')

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with open(destfile, 'w', encoding='utf8') as f:

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f.write('# system configuration generated and used by'

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' the sysconfig module\n')

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f.write('build_time_vars = ')

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pprint.pprint(vars, stream=f)

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# Create file used for sys.path fixup -- see Modules/getpath.c

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with open('pybuilddir.txt', 'w', encoding='utf8') as f:

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f.write(pybuilddir)

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def _init_posix(vars):

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"""Initialize the module as appropriate for POSIX systems."""

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# _sysconfigdata is generated at build time, see _generate_posix_vars()

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name = _get_sysconfigdata_name()

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_temp = __import__(name, globals(), locals(), ['build_time_vars'], 0)

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build_time_vars = _temp.build_time_vars

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vars.update(build_time_vars)

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def _init_non_posix(vars):

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"""Initialize the module as appropriate for NT"""

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# set basic install directories

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import _imp

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vars['LIBDEST'] = get_path('stdlib')

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vars['BINLIBDEST'] = get_path('platstdlib')

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vars['INCLUDEPY'] = get_path('include')

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vars['EXT_SUFFIX'] = _imp.extension_suffixes()[0]

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vars['EXE'] = '.exe'

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vars['VERSION'] = _PY_VERSION_SHORT_NO_DOT

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vars['BINDIR'] = os.path.dirname(_safe_realpath(sys.executable))

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#

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# public APIs

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#

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def parse_config_h(fp, vars=None):

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"""Parse a config.h-style file.

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A dictionary containing name/value pairs is returned. If an

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optional dictionary is passed in as the second argument, it is

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used instead of a new dictionary.

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"""

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if vars is None:

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vars = {}

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import re

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define_rx = re.compile("#define ([A-Z][A-Za-z0-9_]+) (.*)\n")

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undef_rx = re.compile("/[*] #undef ([A-Z][A-Za-z0-9_]+) [*]/\n")

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while True:

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line = fp.readline()

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if not line:

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break

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m = define_rx.match(line)

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if m:

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n, v = m.group(1, 2)

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try:

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if n in _ALWAYS_STR:

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raise ValueError

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v = int(v)

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except ValueError:

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pass

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vars[n] = v

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else:

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m = undef_rx.match(line)

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if m:

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vars[m.group(1)] = 0

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return vars

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def get_config_h_filename():

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"""Return the path of pyconfig.h."""

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if _PYTHON_BUILD:

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if os.name == "nt":

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inc_dir = os.path.join(_sys_home or _PROJECT_BASE, "PC")

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else:

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inc_dir = _sys_home or _PROJECT_BASE

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else:

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inc_dir = get_path('platinclude')

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return os.path.join(inc_dir, 'pyconfig-64.h')

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def get_scheme_names():

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"""Return a tuple containing the schemes names."""

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