本文实例讲述了Python使用defaultdict读取文件各列的方法。分享给大家供大家参考，具体如下：
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#!/usr/bin/python
"""USAGE: python *.py align_SNP_site out_file"""
import sys
#import time
from collections import Counter
#t0=time.clock()
info=open(sys.argv[1])
fast=sys.argv[2]
d_c = {}
d1={}
d2={}
for line in info:
cols=line.strip().split("\t")
if cols[0] == "SNP pattern":
continue
else:
d1.setdefault(cols[4],[]).append(cols[1])
d2.setdefault(cols[7],[]).append(cols[1])
#d1.setdefault(cols[0],[]).append(cols[5])
#d2[cols[0]] = "\t".join(cols[0:3])
info.close()
print len(d1)
print len(d2)
my_list=[]
ref_fa = open("some_example.fasta", 'r')
for i in ref_fa.readlines():
if i.startswith(">"):
my_list.append(i.rstrip())
ref_fa.close()
print len(my_list)
#sys.exit()
result = open(fast,'w')
for k,v in d1.iteritems():
cnt1 = Counter(v)
#print cnt1
result.write("%s\t" % k)
for i in sorted(cnt1.items(), key = lambda x: x[1], reverse=True):
result.write("%s\t%d\t"%(i[0],i[1]))
result.write("\n")
for k,v in d2.iteritems():
cnt2 = Counter(v)
#print cnt2
result.write("%s\t" % k)
for i in sorted(cnt2.items(), key = lambda x: x[1], reverse=False):
result.write("%s\t%d\t"%( i[0],i[1]))
result.write("\n")
#t1=time.clock()
#print (t1-t0)
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希望本文所述对大家Python程序设计有所帮助。