human
Write me a the Python program you requested given the following:
Complete the below
def bulk_install():

    ''''Install a list of apps'
    '''
assistant
#Here is the Python program you requested.
    def b64pack(app):
        "\n                                Given    an    app's    name,    return    the    base64    representation    of    its    packed    version.\n                                "
        folder = apath(app, r=request)
        tmpfile = StringIO()
        tar = tarfile.TarFile(fileobj=tmpfile, mode='w')
        try:
            filenames = listdir(folder, '^[\\w\\.\\-]+$', add_dirs=True, exclude_content_from=['cache', 'sessions', 'errors'])
            for fname in filenames:
                tar.add(os.path.join(folder, fname), fname, False)
        finally:
            tar.close()
        tmpfile.seek(0)
        gzfile = StringIO()
        w2pfp = gzip.GzipFile(fileobj=gzfile, mode='wb')
        w2pfp.write(tmpfile.read())
        w2pfp.close()
        gzfile.seek(0)
        return base64.b64encode(gzfile.read())
    request.vars.apps = request.vars['apps[]']
    if ((not request.vars.apps) or (not request.vars.username) or (not request.vars.password)):
        raise HTTP(400)
    if (not isinstance(request.vars.apps, list)):
        request.vars.apps = [request.vars.apps]
    client = ServerProxy(('https://%(username)s:%(password)s@%(username)s.pythonanywhere.com/admin/webservices/call/jsonrpc' % request.vars))
    for app in request.vars.apps:
        try:
            client.install(app, (app + '.w2p'), b64pack(app))
        except ProtocolError as error:
            raise HTTP(error.errcode)
    return response.json({'status': 'ok'})