for循环问题 [英] for loop problem

问题描述

For循环问题：

For loop issue:

in1 = open('file_1', 'r')
in2 = open('file_2', 'r')
outf = open('out_file', 'w')


for line in in1:
    s = line.split('\t')
    A = s[1][:-1]
    B = s[0]
    counter = 0
    for line in in2:
        ss = line.split('\t')
        if A == ss[0] or A == ss[1]:
            counter += 1
    outf.write('%s\t%s\t%s\n'%(A,B,counter))

问题在于它只是通过来处理in2中的行：对于in1中的第一个行。我似乎无法找出原因。

The problem is that it is only going through for line in in2: for the first line in in1. I can't seem to figure out why.

推荐答案

您只能迭代一次文件。再次从头开始，使用

You can iterate over a file only once. To start from the beginning again, use

in2.seek(0)

在内部循环之前。

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