如何使用csv.DictReader跳过标题前行？

如何使用csv.DictReader跳过标题前行？

我从itertools使用过islice。我的标题位于重要序言的最后一行。我已经通过了序言，并使用hederline作为字段名：

with open(file, "r") as f:    '''Pass preamble'''    n = 0    for line in f.readlines():        n += 1        if 'same_field_name' in line: # line with field names was found h = line.split(',') break    f.close()    f = islice(open(i, "r"), n, None)    reader = csv.DictReader(f, fieldnames = h)