python连续处理两行数据

最近需要处理一个文件中的所有连续行的数据内容

import os
import linecache
#f = open('myout')
count = len(open('myout').readlines())
#last_pos = f.tell()  # get to know the current position in the file
#f.seek(last_pos)
#fst_line=f.readline()
#last_pos = last_pos + 1
#sec_line=f.readline()
#last_pos = last_pos + 1
#print fst_line.split(" ")[0]
#print sec_line.split(" ")[0]


#f.close()

for i in range(count-1):
    fst_line=linecache.getline('myout',i)
    sec_line=linecache.getline('myout',i+1)
    print fst_line.split(" ")[0]
    print sec_line.split(" ")[0]

#with open('myout') as f:
#    for line in f:
#        last_pos = f.tell()
#        fst_line=line
#        sec_line=line[1]
#        print fst_line
#        print sec_line