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>>> f = open('b.txt')
>>> lines = f.readlines()
>>> ta = open('b.txt', 'w')
>>> tb = open('c.txt', 'w')
>>> for i in xrange(0, len(lines), 2):
... if 'asdf' in lines[i]:
... ta.writelines(lines[i:i+2])
... elif 'werwer' in lines[i]:
... tb.writelines(lines[i:i+2])
...
>>> ta.close()
>>> tb.close()