def matrix(m, n, a=0.0, b=0.0):
    if a == b == 0:
        return [[0.0] * n for i in xrange(m)]
    return [[uniform(a, b) for j in xrange(n)] for i in xrange(m)]
:param packed_int: a packed string containing an unsigned integer.
dataset/ETHPy150Open clips/pattern/pattern/vector/__init__.py/matrix--crossover with--dataset/ETHPy150Open drkjam/netaddr/netaddr/strategy/ipv6.py/packed_to_int