import numbers
class Matrix(object):
    def __init__(self, seq, num_cols=1):
        self.m = seq
        self.num_cols = num_cols
        self.num_rows = len(seq) / num_cols

    def __getitem__(self, idx):
        row, col = idx
        if isinstance(row, numbers.Integral) and isinstance(col, numbers.Integral):
            return self.m[self.num_cols * row + col]

        elif isinstance(row, numbers.Integral) and isinstance(col, slice):
            start = self.num_cols * row
            stop = start + self.num_cols
            row_seq = self.m[slice(start, stop, 1)]
            return row_seq[col]

        elif isinstance(row, slice) and isinstance(col, numbers.Integral):
            start = col
            end = len(self.m) + col - self.num_cols + 1
            col_seq = self.m[slice(start, end, self.num_cols)]
            return col_seq[row]
        else:
            raise ValueError('\n\nOnly supports access for slicing like:\nM[1, 2], M[:, 0], M[2, :]\n\n')

    def __setitem__(self, key, value):
        raise NotImplementedError('Setting items not supported')