def identity_abs(aseq, bseq):
assert len(aseq) == len(bseq)<EOL>return sum(a == b<EOL>for a, b in zip(aseq, bseq)<EOL>if not (a in '<STR_LIT>' and b in '<STR_LIT>'))<EOL>
Compute absolute identity (# matching sites) between sequence strings.