def install_python(home_dir, lib_dir, inc_dir, bin_dir, site_packages, clear):
    if sys.executable.startswith(bin_dir):
        print 'Please use the *system* python to run this script'
        return

    if clear:
        rmtree(lib_dir)
        ## FIXME: why not delete it?
        ## Maybe it should delete everything with #!/path/to/venv/python in it
        logger.notify('Not deleting %s', bin_dir)

    if hasattr(sys, 'real_prefix'):
        logger.notify('Using real prefix %r' % sys.real_prefix)
        prefix = sys.real_prefix
    else:
        prefix = sys.prefix
    mkdir(lib_dir)
    fix_lib64(lib_dir)
    stdlib_dirs = [os.path.dirname(os.__file__)]
    if sys.platform == 'win32':
        stdlib_dirs.append(join(os.path.dirname(stdlib_dirs[0]), 'DLLs'))
    elif sys.platform == 'darwin':
        stdlib_dirs.append(join(stdlib_dirs[0], 'site-packages'))
    for stdlib_dir in stdlib_dirs:
        if not os.path.isdir(stdlib_dir):
            continue
        if hasattr(os, 'symlink'):
            logger.info('Symlinking Python bootstrap modules')
        else:
            logger.info('Copying Python bootstrap modules')
        logger.indent += 2
        try:
            for fn in os.listdir(stdlib_dir):
                if fn != 'site-packages' and os.path.splitext(fn)[0] in REQUIRED_MODULES:
                    copyfile(join(stdlib_dir, fn), join(lib_dir, fn))
        finally:
            logger.indent -= 2
    mkdir(join(lib_dir, 'site-packages'))
    writefile(join(lib_dir, 'site.py'), SITE_PY)
    writefile(join(lib_dir, 'orig-prefix.txt'), prefix)
    site_packages_filename = join(lib_dir, 'no-global-site-packages.txt')
    if not site_packages:
        writefile(site_packages_filename, '')
    else:
        if os.path.exists(site_packages_filename):
            logger.info('Deleting %s' % site_packages_filename)
            os.unlink(site_packages_filename)

    stdinc_dir = join(prefix, 'include', py_version)
    if os.path.exists(stdinc_dir):
        copyfile(stdinc_dir, inc_dir)
    else:
        logger.debug('No include dir %s' % stdinc_dir)

    if sys.exec_prefix != prefix:
        if sys.platform == 'win32':
            exec_dir = join(sys.exec_prefix, 'lib')
        elif is_jython:
            exec_dir = join(sys.exec_prefix, 'Lib')
        else:
            exec_dir = join(sys.exec_prefix, 'lib', py_version)
        for fn in os.listdir(exec_dir):
            copyfile(join(exec_dir, fn), join(lib_dir, fn))

    if is_jython:
        # Jython has either jython-dev.jar and javalib/ dir, or just
        # jython.jar
        for name in 'jython-dev.jar', 'javalib', 'jython.jar':
            src = join(prefix, name)
            if os.path.exists(src):
                copyfile(src, join(home_dir, name))
        # XXX: registry should always exist after Jython 2.5rc1
        src = join(prefix, 'registry')
        if os.path.exists(src):
            copyfile(src, join(home_dir, 'registry'), symlink=False)
        copyfile(join(prefix, 'cachedir'), join(home_dir, 'cachedir'),
                 symlink=False)

    mkdir(bin_dir)
    py_executable = join(bin_dir, os.path.basename(sys.executable))
    if 'Python.framework' in prefix:
        if re.search(r'/Python(?:-32|-64)*$', py_executable):
            # The name of the python executable is not quite what
            # we want, rename it.
            py_executable = os.path.join(
                    os.path.dirname(py_executable), 'python')

    logger.notify('New %s executable in %s', expected_exe, py_executable)
    if sys.executable != py_executable:
        ## FIXME: could I just hard link?
        executable = sys.executable
        if sys.platform == 'cygwin' and os.path.exists(executable + '.exe'):
            # Cygwin misreports sys.executable sometimes
            executable += '.exe'
            py_executable += '.exe'
            logger.info('Executable actually exists in %s' % executable)
        shutil.copyfile(executable, py_executable)
        make_exe(py_executable)
        if sys.platform == 'win32' or sys.platform == 'cygwin':
            pythonw = os.path.join(os.path.dirname(sys.executable), 'pythonw.exe')
            if os.path.exists(pythonw):
                logger.info('Also created pythonw.exe')
                shutil.copyfile(pythonw, os.path.join(os.path.dirname(py_executable), 'pythonw.exe'))

    if os.path.splitext(os.path.basename(py_executable))[0] != expected_exe:
        secondary_exe = os.path.join(os.path.dirname(py_executable),
                                     expected_exe)
        py_executable_ext = os.path.splitext(py_executable)[1]
        if py_executable_ext == '.exe':
            # python2.4 gives an extension of '.4' :P
            secondary_exe += py_executable_ext
        if os.path.exists(secondary_exe):
            logger.warn('Not overwriting existing %s script %s (you must use %s)'
                        % (expected_exe, secondary_exe, py_executable))
        else:
            logger.notify('Also creating executable in %s' % secondary_exe)
            shutil.copyfile(sys.executable, secondary_exe)
            make_exe(secondary_exe)

    if 'Python.framework' in prefix:
        logger.debug('MacOSX Python framework detected')

        # Make sure we use the the embedded interpreter inside
        # the framework, even if sys.executable points to
        # the stub executable in ${sys.prefix}/bin
        # See http://groups.google.com/group/python-virtualenv/
        #                              browse_thread/thread/17cab2f85da75951
        shutil.copy(
                os.path.join(
                    prefix, 'Resources/Python.app/Contents/MacOS/%s' % os.path.basename(sys.executable)),
                py_executable)

        # Copy the framework's dylib into the virtual
        # environment
        virtual_lib = os.path.join(home_dir, '.Python')

        if os.path.exists(virtual_lib):
            os.unlink(virtual_lib)
        copyfile(
            os.path.join(prefix, 'Python'),
            virtual_lib)

        # And then change the install_name of the copied python executable
        try:
            call_subprocess(
                ["install_name_tool", "-change",
                 os.path.join(prefix, 'Python'),
                 '@executable_path/../.Python',
                 py_executable])
        except:
            logger.fatal(
                "Could not call install_name_tool -- you must have Apple's development tools installed")
            raise

        # Some tools depend on pythonX.Y being present
        py_executable_version = '%s.%s' % (
            sys.version_info[0], sys.version_info[1])
        if not py_executable.endswith(py_executable_version):
            # symlinking pythonX.Y > python
            pth = py_executable + '%s.%s' % (
                    sys.version_info[0], sys.version_info[1])
            if os.path.exists(pth):
                os.unlink(pth)
            os.symlink('python', pth)
        else:
            # reverse symlinking python -> pythonX.Y (with --python)
            pth = join(bin_dir, 'python')
            if os.path.exists(pth):
                os.unlink(pth)
            os.symlink(os.path.basename(py_executable), pth)

    if sys.platform == 'win32' and ' ' in py_executable:
        # There's a bug with subprocess on Windows when using a first
        # argument that has a space in it.  Instead we have to quote
        # the value:
        py_executable = '"%s"' % py_executable
    cmd = [py_executable, '-c', 'import sys; print sys.prefix']
    logger.info('Testing executable with %s %s "%s"' % tuple(cmd))
    proc = subprocess.Popen(cmd,
                            stdout=subprocess.PIPE)
    proc_stdout, proc_stderr = proc.communicate()
    proc_stdout = os.path.normcase(os.path.abspath(proc_stdout.strip()))
    if proc_stdout != os.path.normcase(os.path.abspath(home_dir)):
        logger.fatal(
            'ERROR: The executable %s is not functioning' % py_executable)
        logger.fatal(
            'ERROR: It thinks sys.prefix is %r (should be %r)'
            % (proc_stdout, os.path.normcase(os.path.abspath(home_dir))))
        logger.fatal(
            'ERROR: virtualenv is not compatible with this system or executable')
        if sys.platform == 'win32':
            logger.fatal(
                'Note: some Windows users have reported this error when they installed Python for "Only this user".  The problem may be resolvable if you install Python "For all users".  (See https://bugs.launchpad.net/virtualenv/+bug/352844)')
        sys.exit(100)
    else:
        logger.info('Got sys.prefix result: %r' % proc_stdout)

    pydistutils = os.path.expanduser('~/.pydistutils.cfg')
    if os.path.exists(pydistutils):
        logger.notify('Please make sure you remove any previous custom paths from '
                      'your %s file.' % pydistutils)
    ## FIXME: really this should be calculated earlier
    return py_executable
Detect whether the application usage table exists.
dataset/ETHPy150Open ralfonso/theory/go-pylons.py/install_python--crossover with--dataset/ETHPy150Open google/macops/crankd/ApplicationUsage.py/ApplicationUsage._DetectApplicationUsageTable