def entrez(db, acc):
c1 = ['<STR_LIT>', '<STR_LIT>', db, '<STR_LIT>', acc]<EOL>c2 = ['<STR_LIT>', '<STR_LIT>', '<STR_LIT>', '<STR_LIT>', '<STR_LIT>']<EOL>p1 = Popen(c1, stdout = PIPE, stderr = PIPE)<EOL>p2 = Popen(c2, stdin = p1.stdout, stdout = PIPE, stderr = PIPE)<EOL>return p2.communicate()<EOL>
search entrez using specified database
and accession