def percentNuc(self, nuc):
count = reduce(lambda x, y: x + <NUM_LIT:1> if y == nuc else x, self.sequenceData, <NUM_LIT:0>)<EOL>return count / float(len(self.sequenceData))<EOL>
return the percentage of the sequence which is equal to the passed nuc.

:param nuc: the nucleotide to compute percentage composition for. There
            is no check to make sure this is a valid nucleotide.
:return: the percentage of the sequence that is <nuc>