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)
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