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a.txt
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om 2 0.68 0.83 0 0 0 0 0 0
pos
ppa 17 0.74 0.9 0 0 0 1 2 2
ppc    2                     2 0.51 0.75 0 0 1

È»ºóÓÃÒÔÏ´úÂë²Ù×÷Õâ¸öÎı¾Îļþ
f = open("a.txt")
for aline in  f.readlines():
    //ʵÏÖ´úÂë
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eachlineList = aline.split()
if re.match('ppa',eachlineList[0]):#Æ¥ÅäµÚÒ»ÁÐ
    print eachlineList[4]££´òÓ¡µÚËÄÁÐ

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try:
    print aline.split('\t').[3]
except:
    print 0

Thank you for luckygxboy &  yuanvshu.
The solution from luckygxboy is done.



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