def __boot():

    import sys

    import os

    PYTHONPATH = os.environ.get('PYTHONPATH')

    if PYTHONPATH is None or (sys.platform == 'win32' and not PYTHONPATH):

        PYTHONPATH = []

    else:

        PYTHONPATH = PYTHONPATH.split(os.pathsep)

​

    pic = getattr(sys, 'path_importer_cache', {})

    stdpath = sys.path[len(PYTHONPATH):]

    mydir = os.path.dirname(__file__)

​

    for item in stdpath:

        if item == mydir or not item:

            continue  # skip if current dir. on Windows, or my own directory

        importer = pic.get(item)

        if importer is not None:

            loader = importer.find_module('site')

            if loader is not None:

                # This should actually reload the current module

                loader.load_module('site')

                break

        else:

            try:

                import imp  # Avoid import loop in Python >= 3.3

                stream, path, descr = imp.find_module('site', [item])

            except ImportError:

                continue

            if stream is None:

                continue

            try:

                # This should actually reload the current module

                imp.load_module('site', stream, path, descr)

            finally:

                stream.close()

            break

    else:

        raise ImportError("Couldn't find the real 'site' module")

​

    known_paths = dict([(makepath(item)[1], 1) for item in sys.path])  # 2.2 comp

​

    oldpos = getattr(sys, '__egginsert', 0)  # save old insertion position