python将文本分每两行一组

# -*- coding: utf-8 -*-
'''
python读取文件，每两行为一组
'''
def fenhang(infile,outfile):

    infopen = open(infile,'r',encoding='utf-8')
    outopen = open(outfile,'w',encoding='utf-8')
    lines = infopen.readlines()
    i = 1
    for line in lines:
        if i % 2 == 0:
            outopen.write(line+'\n')
        else:
            outopen.write(line)
        i += 1
    infopen.close()
    outopen.close()
fenhang("源文件路径","目标文件路径")