Eval: Sort csv results based on node number

    with open(filepath, 'r') as rf:

        for line in rf.readlines():

            if 'mdtest-1.9.3 was launched with' in line:

                n = line.strip().split(' ')[-2]

                n = int(line.strip().split(' ')[-2])

            if 'SUMMARY: (of' in line:

                flag = True

            if '-- finished at ' in line or 'V-1: Entering timestamp...' in line:

                flag = False

            if flag:

                mdtest_out.append(line.strip())

    if len(mdtest_out) == 0:

        # something is wrong. discard this file

        print 'File %s does not contain mdtest results' % filepath

        return

    # Filter for relevant stuff

    mdtest_out = mdtest_out[3:-2]

    # put create stat and remove into dict index 0: avg, index 1 std

        for file in files:

            filepath = '%s/%s' % (root, file)

            parse_file(filepath)

    # create output

    csv = 'n,creates/sec,create_std,stats/sec,stat_std,remove/sec,remove_std\n'

    # first put node number and their mdtest numbers in list and sort them

    csv_l = list()

    for i in range(len(node_n)):

        csv += '%s,' % node_n[i]

        csv += '%s,' % mdtest_d['create'][i]

        csv += '%s,' % mdtest_d['stat'][i]

        csv += '%s\n' % mdtest_d['remove'][i]

        csv_line = ''

        csv_line += '%s,' % mdtest_d['create'][i]

        csv_line += '%s,' % mdtest_d['stat'][i]

        csv_line += '%s\n' % mdtest_d['remove'][i]

        csv_l.append([node_n[i], csv_line])

    csv_l.sort(key=lambda x: x[0])

    # convert sorted list into csv text file

    csv = 'n,creates/sec,create_std,stats/sec,stat_std,remove/sec,remove_std\n'

    for i in csv_l:

        csv += '%d,%s' % (i[0], i[1])

    # print output

    if printshell:

        print csv

    if not printonly and outpath != '':