def setup_python(self, context):
        """
        Set up a Python executable in the environment.

        :param context: The information for the environment creation request
                        being processed.
        """
        binpath = context.bin_path
        path = context.env_exe
        copier = self.symlink_or_copy
        dirname = context.python_dir
        if os.name != 'nt':
            copier(context.executable, path)
            if not os.path.islink(path):
                os.chmod(path, 0o755)
            for suffix in ('python', 'python3'):
                path = os.path.join(binpath, suffix)
                if not os.path.exists(path):
                    # Issue 18807: make copies if
                    # symlinks are not wanted
                    copier(context.env_exe, path, relative_symlinks_ok=True)
                    if not os.path.islink(path):
                        os.chmod(path, 0o755)
        else:
            if self.symlinks:
                # For symlinking, we need a complete copy of the root directory
                # If symlinks fail, you'll get unnecessary copies of files, but
                # we assume that if you've opted into symlinks on Windows then
                # you know what you're doing.
                suffixes = [
                    f for f in os.listdir(dirname) if
                    os.path.normcase(os.path.splitext(f)[1]) in ('.exe', '.dll')
                ]
                if sysconfig.is_python_build(True):
                    suffixes = [
                        f for f in suffixes if
                        os.path.normcase(f).startswith(('python', 'vcruntime'))
                    ]
            else:
                suffixes = ['python.exe', 'python_d.exe', 'pythonw.exe',
                            'pythonw_d.exe']

            for suffix in suffixes:
                src = os.path.join(dirname, suffix)
                if os.path.exists(src):
                    copier(src, os.path.join(binpath, suffix))

            if sysconfig.is_python_build(True):
                # copy init.tcl
                for root, dirs, files in os.walk(context.python_dir):
                    if 'init.tcl' in files:
                        tcldir = os.path.basename(root)
                        tcldir = os.path.join(context.env_dir, 'Lib', tcldir)
                        if not os.path.exists(tcldir):
                            os.makedirs(tcldir)
                        src = os.path.join(root, 'init.tcl')
                        dst = os.path.join(tcldir, 'init.tcl')
                        shutil.copyfile(src, dst)
                        break

    def create_test(self, name=None, code=None):
        if not name:
            name = 'noop%s' % BaseTestCase.TEST_UNIQUE_ID
            BaseTestCase.TEST_UNIQUE_ID += 1

        if code is None:
            code = textwrap.dedent("""
                    import unittest

                    class Tests(unittest.TestCase):
                        def test_empty_test(self):
                            pass
                """)

        # test_regrtest cannot be run twice in parallel because
        # of setUp() and create_test()
        name = self.TESTNAME_PREFIX + name
        path = os.path.join(self.tmptestdir, name + '.py')

        self.addCleanup(support.unlink, path)
        # Use 'x' mode to ensure that we do not override existing tests
        try:
            with open(path, 'x', encoding='utf-8') as fp:
                fp.write(code)
        except PermissionError as exc:
            if not sysconfig.is_python_build():
                self.skipTest("cannot write %s: %s" % (path, exc))
            raise
        return name

    def symlink_or_copy(self, src, dst, relative_symlinks_ok=False):
        """
        Try symlinking a file, and if that fails, fall back to copying.
        """
        force_copy = not self.symlinks
        if not force_copy:
            try:
                if not os.path.islink(dst): # can't link to itself!
                    if relative_symlinks_ok:
                        assert os.path.dirname(src) == os.path.dirname(dst)
                        os.symlink(os.path.basename(src), dst)
                    else:
                        os.symlink(src, dst)
            except Exception:   # may need to use a more specific exception
                logger.warning('Unable to symlink %r to %r', src, dst)
                force_copy = True
        if force_copy:
            if os.name == 'nt':
                # On Windows, we rewrite symlinks to our base python.exe into
                # copies of venvlauncher.exe
                basename, ext = os.path.splitext(os.path.basename(src))
                if basename.endswith('_d'):
                    ext = '_d' + ext
                    basename = basename[:-2]
                if sysconfig.is_python_build(True):
                    if basename == 'python':
                        basename = 'venvlauncher'
                    elif basename == 'pythonw':
                        basename = 'venvwlauncher'
                    scripts = os.path.dirname(src)
                else:
                    scripts = os.path.join(os.path.dirname(__file__), "scripts", "nt")
                src = os.path.join(scripts, basename + ext)

            shutil.copyfile(src, dst)

    def test_symlink(self):
        # On Windows, the EXE needs to know where pythonXY.dll is at so we have
        # to add the directory to the path.
        env = None
        if sys.platform == "win32":
            env = {k.upper(): os.environ[k] for k in os.environ}
            env["PATH"] = "{};{}".format(
                os.path.dirname(sys.executable), env.get("PATH", ""))
            # Requires PYTHONHOME as well since we locate stdlib from the
            # EXE path and not the DLL path (which should be fixed)
            env["PYTHONHOME"] = os.path.dirname(sys.executable)
            if sysconfig.is_python_build(True):
                env["PYTHONPATH"] = os.path.dirname(os.__file__)

        # Issue 7880
        def get(python, env=None):
            cmd = [python, '-c',
                   'import sysconfig; print(sysconfig.get_platform())']
            p = subprocess.Popen(cmd, stdout=subprocess.PIPE,
                                 stderr=subprocess.PIPE, env=env)
            out, err = p.communicate()
            if p.returncode:
                print((out, err))
                self.fail('Non-zero return code {0} (0x{0:08X})'
                            .format(p.returncode))
            return out, err
        real = os.path.realpath(sys.executable)
        link = os.path.abspath(TESTFN)
        os.symlink(real, link)
        try:
            self.assertEqual(get(real), get(link, env))
        finally:
            unlink(link)

def main():
    global ENABLE_USER_SITE

    abs__file__()
    known_paths = removeduppaths()
    from sysconfig import is_python_build
    if is_python_build():
        from _sysconfigdata import build_time_vars
        sys.path.append(os.path.join(build_time_vars['abs_builddir'], 'Modules'))
    if ENABLE_USER_SITE is None:
        ENABLE_USER_SITE = check_enableusersite()
    known_paths = addusersitepackages(known_paths)
    known_paths = addsitepackages(known_paths)
    if sys.platform == 'os2emx':
        setBEGINLIBPATH()
    setquit()
    setcopyright()
    sethelper()
    aliasmbcs()
    setencoding()
    execsitecustomize()
    if ENABLE_USER_SITE:
        execusercustomize()
    # Remove sys.setdefaultencoding() so that users cannot change the
    # encoding after initialization.  The test for presence is needed when
    # this module is run as a script, because this code is executed twice.
    if hasattr(sys, "setdefaultencoding"):
        del sys.setdefaultencoding

    def test_architecture_via_symlink(self): # issue3762
        # On Windows, the EXE needs to know where pythonXY.dll and *.pyd is at
        # so we add the directory to the path, PYTHONHOME and PYTHONPATH.
        env = None
        if sys.platform == "win32":
            env = {k.upper(): os.environ[k] for k in os.environ}
            env["PATH"] = "{};{}".format(
                os.path.dirname(sys.executable), env.get("PATH", ""))
            env["PYTHONHOME"] = os.path.dirname(sys.executable)
            if sysconfig.is_python_build(True):
                env["PYTHONPATH"] = os.path.dirname(os.__file__)

        def get(python, env=None):
            cmd = [python, '-c',
                'import platform; print(platform.architecture())']
            p = subprocess.Popen(cmd, stdout=subprocess.PIPE,
                                 stderr=subprocess.PIPE, env=env)
            r = p.communicate()
            if p.returncode:
                print(repr(r[0]))
                print(repr(r[1]), file=sys.stderr)
                self.fail('unexpected return code: {0} (0x{0:08X})'
                          .format(p.returncode))
            return r

        real = os.path.realpath(sys.executable)
        link = os.path.abspath(support.TESTFN)
        os.symlink(real, link)
        try:
            self.assertEqual(get(real), get(link, env=env))
        finally:
            os.remove(link)

def _get_xxmodule_path():
    if sysconfig.is_python_build():
        srcdir = sysconfig.get_config_var('projectbase')
        path = os.path.join(os.getcwd(), srcdir, 'Modules', 'xxmodule.c')
    else:
        path = os.path.join(os.path.dirname(__file__), 'xxmodule.c')
    if os.path.exists(path):
        return path

    def setup_python(self, context):
        """
        Set up a Python executable in the environment.

        :param context: The information for the environment creation request
                        being processed.
        """
        binpath = context.bin_path
        path = context.env_exe
        copier = self.symlink_or_copy
        copier(context.executable, path)
        dirname = context.python_dir
        if os.name != 'nt':
            if not os.path.islink(path):
                os.chmod(path, 0o755)
            for suffix in ('python', 'python3'):
                path = os.path.join(binpath, suffix)
                if not os.path.exists(path):
                    # Issue 18807: make copies if
                    # symlinks are not wanted
                    copier(context.env_exe, path, relative_symlinks_ok=True)
                    if not os.path.islink(path):
                        os.chmod(path, 0o755)
        else:
            # See bpo-34011. When using a proper install, we should only need to
            # copy the top-level of DLLs.
            include = self.include_binary
            files = [f for f in os.listdir(dirname) if include(f)]
            for f in files:
                src = os.path.join(dirname, f)
                dst = os.path.join(binpath, f)
                if dst != context.env_exe:  # already done, above
                    copier(src, dst)

            # When creating from a build directory, we continue to copy all files.
            if sysconfig.is_python_build(True):
                subdir = 'DLLs'
                dirname = os.path.join(dirname, subdir)
                if os.path.isdir(dirname):
                    files = [f for f in os.listdir(dirname) if include(f)]
                    for f in files:
                        src = os.path.join(dirname, f)
                        dst = os.path.join(binpath, f)
                        copier(src, dst)
                # copy init.tcl over
                for root, dirs, files in os.walk(context.python_dir):
                    if 'init.tcl' in files:
                        tcldir = os.path.basename(root)
                        tcldir = os.path.join(context.env_dir, 'Lib', tcldir)
                        if not os.path.exists(tcldir):
                            os.makedirs(tcldir)
                        src = os.path.join(root, 'init.tcl')
                        dst = os.path.join(tcldir, 'init.tcl')
                        shutil.copyfile(src, dst)
                        break

def install(project):
    """Installs a project.

    Returns True on success, False on failure
    """
    if is_python_build():
        # Python would try to install into the site-packages directory under
        # $PREFIX, but when running from an uninstalled code checkout we don't
        # want to create directories under the installation root
        message = ('installing third-party projects from an uninstalled '
                   'Python is not supported')
        logger.error(message)
        return False

    logger.info('Checking the installation location...')
    purelib_path = get_path('purelib')

    # trying to write a file there
    try:
        with tempfile.NamedTemporaryFile(suffix=project,
                                         dir=purelib_path) as testfile:
            testfile.write(b'test')
    except OSError:
        # FIXME this should check the errno, or be removed altogether (race
        # condition: the directory permissions could be changed between here
        # and the actual install)
        logger.info('Unable to write in "%s". Do you have the permissions ?'
                    % purelib_path)
        return False

    logger.info('Getting information about %r...', project)
    try:
        info = get_infos(project)
    except InstallationException:
        logger.info('Cound not find %r', project)
        return False

    if info['install'] == []:
        logger.info('Nothing to install')
        return False

    install_path = get_config_var('base')
    try:
        install_from_infos(install_path,
                           info['install'], info['remove'], info['conflict'])

    except InstallationConflict as e:
        if logger.isEnabledFor(logging.INFO):
            projects = ('%r %s' % (p.name, p.version) for p in e.args[0])
            logger.info('%r conflicts with %s', project, ','.join(projects))

    return True

    def setup_python(self, context):
        """
        Set up a Python executable in the environment.

        :param context: The information for the environment creation request
                        being processed.
        """
        binpath = context.bin_path
        path = context.env_exe
        copier = self.symlink_or_copy
        dirname = context.python_dir
        if os.name != 'nt':
            copier(context.executable, path)
            if not os.path.islink(path):
                os.chmod(path, 0o755)
            for suffix in ('python', 'python3'):
                path = os.path.join(binpath, suffix)
                if not os.path.exists(path):
                    # Issue 18807: make copies if
                    # symlinks are not wanted
                    copier(context.env_exe, path, relative_symlinks_ok=True)
                    if not os.path.islink(path):
                        os.chmod(path, 0o755)
        else:
            # For normal cases, the venvlauncher will be copied from
            # our scripts folder. For builds, we need to copy it
            # manually.
            if sysconfig.is_python_build(True):
                suffix = '.exe'
                if context.python_exe.lower().endswith('_d.exe'):
                    suffix = '_d.exe'

                src = os.path.join(dirname, "venvlauncher" + suffix)
                dst = os.path.join(binpath, context.python_exe)
                copier(src, dst)

                src = os.path.join(dirname, "venvwlauncher" + suffix)
                dst = os.path.join(binpath, "pythonw" + suffix)
                copier(src, dst)

                # copy init.tcl over
                for root, dirs, files in os.walk(context.python_dir):
                    if 'init.tcl' in files:
                        tcldir = os.path.basename(root)
                        tcldir = os.path.join(context.env_dir, 'Lib', tcldir)
                        if not os.path.exists(tcldir):
                            os.makedirs(tcldir)
                        src = os.path.join(root, 'init.tcl')
                        dst = os.path.join(tcldir, 'init.tcl')
                        shutil.copyfile(src, dst)
                        break

def main_in_temp_cwd():
    """Run main() in a temporary working directory."""
    if sysconfig.is_python_build():
        try:
            os.mkdir(TEMPDIR)
        except FileExistsError:
            pass

    # Define a writable temp dir that will be used as cwd while running
    # the tests. The name of the dir includes the pid to allow parallel
    # testing (see the -j option).
    test_cwd = 'test_python_{}'.format(os.getpid())
    test_cwd = os.path.join(TEMPDIR, test_cwd)

    # Run the tests in a context manager that temporarily changes the CWD to a
    # temporary and writable directory.  If it's not possible to create or
    # change the CWD, the original CWD will be used.  The original CWD is
    # available from support.SAVEDCWD.
    with support.temp_cwd(test_cwd, quiet=True):
        main()

    def create_test(self, name=None, code=""):
        if not name:
            name = "noop%s" % BaseTestCase.TEST_UNIQUE_ID
            BaseTestCase.TEST_UNIQUE_ID += 1

        # test_regrtest cannot be run twice in parallel because
        # of setUp() and create_test()
        name = self.TESTNAME_PREFIX + "%s_%s" % (os.getpid(), name)
        path = os.path.join(self.testdir, name + ".py")

        self.addCleanup(support.unlink, path)
        # Use 'x' mode to ensure that we do not override existing tests
        try:
            with open(path, "x", encoding="utf-8") as fp:
                fp.write(code)
        except PermissionError as exc:
            if not sysconfig.is_python_build():
                self.skipTest("cannot write %s: %s" % (path, exc))
            raise
        return name

def fixup_build_ext(cmd):
    """Function needed to make build_ext tests pass.

    When Python was built with --enable-shared on Unix, -L. is not enough to
    find libpython<blah>.so, because regrtest runs in a tempdir, not in the
    source directory where the .so lives.  (Mac OS X embeds absolute paths
    to shared libraries into executables, so the fixup is a no-op on that
    platform.)

    When Python was built with in debug mode on Windows, build_ext commands
    need their debug attribute set, and it is not done automatically for
    some reason.

    This function handles both of these things, and also fixes
    cmd.distribution.include_dirs if the running Python is an uninstalled
    build.  Example use:

        cmd = build_ext(dist)
        support.fixup_build_ext(cmd)
        cmd.ensure_finalized()
    """
    if os.name == 'nt':
        cmd.debug = sys.executable.endswith('_d.exe')
    elif sysconfig.get_config_var('Py_ENABLE_SHARED'):
        # To further add to the shared builds fun on Unix, we can't just add
        # library_dirs to the Extension() instance because that doesn't get
        # plumbed through to the final compiler command.
        runshared = sysconfig.get_config_var('RUNSHARED')
        if runshared is None:
            cmd.library_dirs = ['.']
        else:
            if sys.platform == 'darwin':
                cmd.library_dirs = []
            else:
                name, equals, value = runshared.partition('=')
                cmd.library_dirs = value.split(os.pathsep)

    # Allow tests to run with an uninstalled Python
    if sysconfig.is_python_build():
        pysrcdir = sysconfig.get_config_var('projectbase')
        cmd.distribution.include_dirs.append(os.path.join(pysrcdir, 'Include'))

 def test_exception(self):
     parser = expat.ParserCreate()
     parser.StartElementHandler = self.StartElementHandler
     try:
         parser.Parse(b"<a><b><c/></b></a>", 1)
         self.fail()
     except RuntimeError as e:
         self.assertEqual(e.args[0], 'a',
                          "Expected RuntimeError for element 'a', but" + \
                          " found %r" % e.args[0])
         # Check that the traceback contains the relevant line in pyexpat.c
         entries = traceback.extract_tb(e.__traceback__)
         self.assertEqual(len(entries), 3)
         self.check_traceback_entry(entries[0],
                                    "test_pyexpat.py", "test_exception")
         self.check_traceback_entry(entries[1],
                                    "pyexpat.c", "StartElement")
         self.check_traceback_entry(entries[2],
                                    "test_pyexpat.py", "StartElementHandler")
         if sysconfig.is_python_build():
             self.assertIn('call_with_frame("StartElement"', entries[1][3])

    def create_test(self, name=None, code=''):
        if not name:
            name = 'noop%s' % BaseTestCase.TEST_UNIQUE_ID
            BaseTestCase.TEST_UNIQUE_ID += 1

        # test_regrtest cannot be run twice in parallel because
        # of setUp() and create_test()
        name = self.TESTNAME_PREFIX + name
        path = os.path.join(self.tmptestdir, name + '.py')

        self.addCleanup(support.unlink, path)
        # Use O_EXCL to ensure that we do not override existing tests
        try:
            fd = os.open(path, os.O_WRONLY | os.O_CREAT | os.O_EXCL)
        except OSError as exc:
            if (exc.errno in (errno.EACCES, errno.EPERM)
               and not sysconfig.is_python_build()):
                self.skipTest("cannot write %s: %s" % (path, exc))
            else:
                raise
        else:
            with os.fdopen(fd, 'w') as fp:
                fp.write(code)
        return name

    # 'GNU gdb (GDB) Fedora 7.9.1-17.fc22\n' -> 7.9
    # 'GNU gdb 6.1.1 [FreeBSD]\n' -> 6.1
    # 'GNU gdb (GDB) Fedora (7.5.1-37.fc18)\n' -> 7.5
    match = re.search(r"^GNU gdb.*?\b(\d+)\.(\d+)", version)
    if match is None:
        raise Exception("unable to parse GDB version: %r" % version)
    return (version, int(match.group(1)), int(match.group(2)))

gdb_version, gdb_major_version, gdb_minor_version = get_gdb_version()
if gdb_major_version < 7:
    raise unittest.SkipTest("gdb versions before 7.0 didn't support python "
                            "embedding. Saw %s.%s:\n%s"
                            % (gdb_major_version, gdb_minor_version,
                               gdb_version))

if not sysconfig.is_python_build():
    raise unittest.SkipTest("test_gdb only works on source builds at the moment.")

# Location of custom hooks file in a repository checkout.
checkout_hook_path = os.path.join(os.path.dirname(sys.executable),
                                  'python-gdb.py')

PYTHONHASHSEED = '123'

def run_gdb(*args, **env_vars):
    """Runs gdb in --batch mode with the additional arguments given by *args.

    Returns its (stdout, stderr) decoded from utf-8 using the replace handler.
    """
    if env_vars:
        env = os.environ.copy()

    def copy_scripts (self):
        """Copy each script listed in 'self.scripts'; if it's marked as a
        Python script in the Unix way (first line matches 'first_line_re',
        ie. starts with "\#!" and contains "python"), then adjust the first
        line to refer to the current Python interpreter as we copy.
        """
        self.mkpath(self.build_dir)
        outfiles = []
        for script in self.scripts:
            adjust = 0
            script = convert_path(script)
            outfile = os.path.join(self.build_dir, os.path.basename(script))
            outfiles.append(outfile)

            if not self.force and not newer(script, outfile):
                log.debug("not copying %s (up-to-date)", script)
                continue

            # Always open the file, but ignore failures in dry-run mode --
            # that way, we'll get accurate feedback if we can read the
            # script.
            try:
                f = open(script, "r")
            except IOError:
                if not self.dry_run:
                    raise
                f = None
            else:
                first_line = f.readline()
                if not first_line:
                    self.warn("%s is an empty file (skipping)" % script)
                    continue

                match = first_line_re.match(first_line)
                if match:
                    adjust = 1
                    post_interp = match.group(1) or ''

            if adjust:
                log.info("copying and adjusting %s -> %s", script,
                         self.build_dir)
                if not self.dry_run:
                    outf = open(outfile, "w")
                    if not sysconfig.is_python_build():
                        outf.write("#!%s%s\n" %
                                   (self.executable,
                                    post_interp))
                    else:
                        outf.write("#!%s%s\n" %
                                   (os.path.join(
                            sysconfig.get_config_var("BINDIR"),
                           "python%s%s" % (sysconfig.get_config_var("VERSION"),
                                           sysconfig.get_config_var("EXE"))),
                                    post_interp))
                    outf.writelines(f.readlines())
                    outf.close()
                if f:
                    f.close()
            else:
                if f:
                    f.close()
                self.copy_file(script, outfile)

        if os.name == 'posix':
            for file in outfiles:
                if self.dry_run:
                    log.info("changing mode of %s", file)
                else:
                    oldmode = os.stat(file)[ST_MODE] & 07777
                    newmode = (oldmode | 0555) & 07777
                    if newmode != oldmode:
                        log.info("changing mode of %s from %o to %o",
                                 file, oldmode, newmode)
                        os.chmod(file, newmode)
        return outfiles

    findtests, runtest, get_abs_module,
    STDTESTS, NOTTESTS, PASSED, FAILED, ENV_CHANGED, SKIPPED, RESOURCE_DENIED,
    INTERRUPTED, CHILD_ERROR,
    PROGRESS_MIN_TIME, format_test_result)
from test.libregrtest.setup import setup_tests
from test import support
try:
    import gc
except ImportError:
    gc = None


# When tests are run from the Python build directory, it is best practice
# to keep the test files in a subfolder.  This eases the cleanup of leftover
# files using the "make distclean" command.
if sysconfig.is_python_build():
    TEMPDIR = sysconfig.get_config_var('abs_builddir')
    if TEMPDIR is None:
        # bpo-30284: On Windows, only srcdir is available. Using abs_builddir
        # mostly matters on UNIX when building Python out of the source tree,
        # especially when the source tree is read only.
        TEMPDIR = sysconfig.get_config_var('srcdir')
    TEMPDIR = os.path.join(TEMPDIR, 'build')
else:
    TEMPDIR = tempfile.gettempdir()
TEMPDIR = os.path.abspath(TEMPDIR)


def format_duration(seconds):
    if seconds < 1.0:
        return '%.0f ms' % (seconds * 1e3)

# coding=utf-8
# 使用sysconfig

import sysconfig

print sysconfig.get_config_var('Py_ENABLE_SHARED')
print sysconfig.get_config_var('LIBDIR')
print sysconfig.get_config_vars('AR', "CXX")


print sysconfig.get_scheme_names()
print sysconfig.get_path_names()

print sysconfig.get_python_version()
print sysconfig.get_platform()

# return true if current python installation was built from source
print sysconfig.is_python_build()

print sysconfig.get_config_h_filename()
print sysconfig._get_makefile_filename()

    def copy_scripts(self):
        """Copy each script listed in 'self.scripts'; if it's marked as a
        Python script in the Unix way (first line matches 'first_line_re',
        ie. starts with "\#!" and contains "python"), then adjust the first
        line to refer to the current Python interpreter as we copy.
        """
        self.mkpath(self.build_dir)
        outfiles = []
        for script in self.scripts:
            adjust = False
            script = convert_path(script)
            outfile = os.path.join(self.build_dir, os.path.basename(script))
            outfiles.append(outfile)

            if not self.force and not newer(script, outfile):
                logger.debug("not copying %s (up-to-date)", script)
                continue

            # Always open the file, but ignore failures in dry-run mode --
            # that way, we'll get accurate feedback if we can read the
            # script.
            try:
                f = open(script, "rb")
            except IOError:
                if not self.dry_run:
                    raise
                f = None
            else:
                encoding, lines = detect_encoding(f.readline)
                f.seek(0)
                first_line = f.readline()
                if not first_line:
                    logger.warning('%s: %s is an empty file (skipping)',
                                   self.get_command_name(),  script)
                    continue

                match = first_line_re.match(first_line)
                if match:
                    adjust = True
                    post_interp = match.group(1) or b''

            if adjust:
                logger.info("copying and adjusting %s -> %s", script,
                         self.build_dir)
                if not self.dry_run:
                    if not sysconfig.is_python_build():
                        executable = self.executable
                    else:
                        executable = os.path.join(
                            sysconfig.get_config_var("BINDIR"),
                           "python%s%s" % (sysconfig.get_config_var("VERSION"),
                                           sysconfig.get_config_var("EXE")))
                    executable = os.fsencode(executable)
                    shebang = b"#!" + executable + post_interp + b"\n"
                    # Python parser starts to read a script using UTF-8 until
                    # it gets a #coding:xxx cookie. The shebang has to be the
                    # first line of a file, the #coding:xxx cookie cannot be
                    # written before. So the shebang has to be decodable from
                    # UTF-8.
                    try:
                        shebang.decode('utf-8')
                    except UnicodeDecodeError:
                        raise ValueError(
                            "The shebang ({!r}) is not decodable "
                            "from utf-8".format(shebang))
                    # If the script is encoded to a custom encoding (use a
                    # #coding:xxx cookie), the shebang has to be decodable from
                    # the script encoding too.
                    try:
                        shebang.decode(encoding)
                    except UnicodeDecodeError:
                        raise ValueError(
                            "The shebang ({!r}) is not decodable "
                            "from the script encoding ({})"
                            .format(shebang, encoding))
                    with open(outfile, "wb") as outf:
                        outf.write(shebang)
                        outf.writelines(f.readlines())
                if f:
                    f.close()
            else:
                if f:
                    f.close()
                self.copy_file(script, outfile)

        if os.name == 'posix':
            for file in outfiles:
                if self.dry_run:
                    logger.info("changing mode of %s", file)
                else:
                    oldmode = os.stat(file).st_mode & 0o7777
                    newmode = (oldmode | 0o555) & 0o7777
                    if newmode != oldmode:
                        logger.info("changing mode of %s from %o to %o",
                                 file, oldmode, newmode)
                        os.chmod(file, newmode)
        return outfiles