(
    version=DEFAULT_VERSION, download_base=DEFAULT_URL, to_dir=os.curdir,
    download_delay=15
)
Automatically find/download setuptools and make it available on sys.path

    `version` should be a valid setuptools version number that is available
    as an egg for download under the `download_base` URL (which should end with
    a '/').  `to_dir` is the directory where setuptools will be downloaded, if
    it is not already available.  If `download_delay` is specified, it should
    be the number of seconds that will be paused before initiating a download,
    should one be required.  If an older version of setuptools is installed,
    this routine will print a message to ``sys.stderr`` and raise SystemExit in
    an attempt to abort the calling script.
Automatically find/download setuptools and make it available on sys.path
Automatically find / download setuptools and make it available on sys . path
def use_setuptools(
    version=DEFAULT_VERSION, download_base=DEFAULT_URL, to_dir=os.curdir,
    download_delay=15
):
    """Automatically find/download setuptools and make it available on sys.path

    `version` should be a valid setuptools version number that is available
    as an egg for download under the `download_base` URL (which should end with
    a '/').  `to_dir` is the directory where setuptools will be downloaded, if
    it is not already available.  If `download_delay` is specified, it should
    be the number of seconds that will be paused before initiating a download,
    should one be required.  If an older version of setuptools is installed,
    this routine will print a message to ``sys.stderr`` and raise SystemExit in
    an attempt to abort the calling script.
    """
    was_imported = 'pkg_resources' in sys.modules or 'setuptools' in sys.modules
    def do_download():
        egg = download_setuptools(version, download_base, to_dir, download_delay)
        sys.path.insert(0, egg)
        import setuptools; setuptools.bootstrap_install_from = egg
    try:
        import pkg_resources
    except ImportError:
        return do_download()       
    try:
        pkg_resources.require("setuptools>="+version); return
    except pkg_resources.VersionConflict, e:
        if was_imported:
            print >>sys.stderr, (
            "The required version of setuptools (>=%s) is not available, and\n"
            "can't be installed while this script is running. Please install\n"
            " a more recent version first, using 'easy_install -U setuptools'."
            "\n\n(Currently using %r)"
            ) % (version, e.args[0])
            sys.exit(2)
        else:
            del pkg_resources, sys.modules['pkg_resources']    # reload ok
            return do_download()
    except pkg_resources.DistributionNotFound:
        return do_download()
def use_setuptools ( version = DEFAULT_VERSION , download_base = DEFAULT_URL , to_dir = os . curdir , download_delay = 15 ) : was_imported = 'pkg_resources' in sys . modules or 'setuptools' in sys . modules def do_download ( ) : egg = download_setuptools ( version , download_base , to_dir , download_delay ) sys . path . insert ( 0 , egg ) import setuptools setuptools . bootstrap_install_from = egg try : import pkg_resources except ImportError : return do_download ( ) try : pkg_resources . require ( "setuptools>=" + version ) return except pkg_resources . VersionConflict , e : if was_imported : print >> sys . stderr , ( "The required version of setuptools (>=%s) is not available, and\n" "can't be installed while this script is running. Please install\n" " a more recent version first, using 'easy_install -U setuptools'." "\n\n(Currently using %r)" ) % ( version , e . args [ 0 ] ) sys . exit ( 2 ) else : del pkg_resources , sys . modules [ 'pkg_resources' ] # reload ok return do_download ( ) except pkg_resources . DistributionNotFound : return do_download ( )