[Python] 跳过前几行快速读取文件内容：islice

from itertools import islice
start = 1  #　跳过第一行idx=0，从idx=1开始读取文件
with codecs.open('data.json', encoding='utf-8') as fr:    
    for idx, line in enumerate(islice(fr, start, None)):
        print idx, line