如何一次遍历2个列表？

Question

with open('myfile.txt') as f:
    for line in f: 
        doSomething(line)

有没有办法一次迭代两个文件？这里有一些伪代码可以帮助您理解..

with open('myfile.txt') as f: and with open ('myfile2.txt') as d:
    for line in f and for line2 in d:
        doSomething(line, line2)

Answer 1

with open('myfile.txt') as f, open('myfile2.txt') as d:
    for line1, line2 in zip(f, d):
        do_something(line1, line2)

请注意，对于Python 2，您应该使用itertools.izip - 它一次只在内存中保存一对行，而不是返回所有行对的列表。