如何在python中的第X行开始阅读？

Question

实际上我读了这样一个文件:

f = open("myfile.txt")
for line in f:
    #do s.th. with the line

我不需要在第一行开始阅读,而是在X线开始阅读？(例如5.)

Answer 1

如果需要,可以使用itertools.islice指定start,stop和step并将其应用于输入文件...

from itertools import islice

with open('yourfile') as fin:
    for line in islice(fin, 5, None):
        pass

Answer 2

打开的文件对象f是迭代器.阅读(并丢弃)前四行,然后继续定期阅读:

with open("myfile.txt", 'r') as f:
    for i in xrange(4):
        next(f, None)
    for line in f:
        #do s.th. with the line