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http://www.ncbi.nlm.nih.gov/COG/old/xognitor.html£¬
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from Bio import Fasta
from Bio.Blast import NCBIWWW

filename_for_blast = 'seq/all.fasta' # Òª×öblastµÄfastaÎļþ

parser = Fasta.RecordParser()

file_for_blast = file(filename_for_blast, 'r')
iterator = Fasta.Iterator(file_for_blast, parser)
while 1:
cur_record = iterator.next()
if cur_record is None:
break
print u'´ò¿ªÊä³öÎļþ%s' % cur_record.title+'.htm'
file_for_blast_result = file(cur_record.title+'.htm', 'w')
print 'Now BLAST >', cur_record.title
''' NCBIWWW.blastº¯ÊýĬÈϵÄblast²ÎÊýÊÇ:
expect='10', alignments='50', timeout=20
'''
try:
blast_result = NCBIWWW.blast('blastn', 'nr', cur_record, \
expect='0.001', alignments='1', timeout=1)
file_for_blast_result.write(blast_result.read())
print u'OK£¬¸ã¶¨Ò»¸ö'
except:
print u'³¬Ê±ÁË£¬×öÏÂÒ»¸ö'
file_for_blast_result.close()
file_for_blast.close()

print u'È«²¿¸ã¶¨!'
raw_input()
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