def build_exact(footprint):
    """Build a PSSM based on p.footprint"""
    PSSM = []
    for char in footprint.lower():
        PSSM.append(exact_codes[char])

    return PSSM
def build_exact(footprint):
	"""Build a PSSM based on p.footprint"""
	PSSM = []
	for char in footprint.lower():
		PSSM.append(exact_codes[char])
	
	return PSSM