def matrix_product(a, b):
"""
:param a:
:param b:
:return:
"""
row_a = [i for i in a]
col_b = [j[0] for j in izip(b)]
if len(row_a) != len(col_b):
raise ValueError
return [sum(element_a * element_b for element_a, element_b in izip(row_a, col_b))]
def p_distance(a, b):
"""
:param a:
:param b:
:return:
"""
if len(a) != len(b):
raise ValueErroк
seq = 0
sub = 0
for i, j in izip(a, b):
if i == j:
seq += 1
elif i != j and i != "-" and j != "-":
seq += 1
sub += 1
return sub / seq
