有时候在编写程序的时候有需求要同时打开多个文件，这几个文件可能是经由原来某个文件拆分，分别进行一些处理后希望合并，此时需要同时打开这些文件并读取。通常Python中打开文本使用的是with语句，比如打开一个文件并读取每一行

with open(filename) as fp:
    for line in fp:
        # do something

为了同时读取多个文件，可以使用下面的代码

with open(filename1) as fp1, open(filename2) as fp2, open(filename3) as fp3:
    for l1 in fp1:
        l2 = fp2.readline()
        l3 = fp3.readline()
        # do something

稍微简介一点可以使用contextlib中的nested，有

from contextlib import nested
with nested(open(filename1), open(filename2), open(filename3)) as (fp1, fp2, fp3):
    for l1 in fp1:
        l2 = fp2.readline()
        l3 = fp3.readline()
        # do something