def largest_number(seq_seq):
    '\n    Returns the largest number in the subsequences of the given\n    sequence of sequences.  Returns None if there are NO numbers\n    in the subsequences.\n\n    For example, if the given argument is:\n        [(3, 1, 4),\n         (13, 10, 11, 7, 10),\n         [1, 2, 3, 4]]\n    then this function returns 13.\n\n    As another example, if the given argument is:\n      ([], [-1111111111111111], [])\n    then this function returns -1111111111111111.\n\n    As yet another example, if the given argument is:\n      ([], [], [])\n    then this function returns None.\n\n    Preconditions:\n      :type seq_seq: (list, tuple)\n    and the given argument is a sequence of sequences,\n    where each subsequence contains only numbers.\n    '
    x = None
    for j in range(len(seq_seq)):
        for k in range(len(seq_seq[j])):
            x = j
            y = k
    for l in range(len(seq_seq)):
        for o in range(len(seq_seq[l])):
            if (seq_seq[l][o] > seq_seq[x][y]):
                x = l
                y = o
    if (x == None):
        return None
    return seq_seq[x][y]
Returns the largest number in the subsequences of the given
sequence of sequences.  Returns None if there are NO numbers
in the subsequences.

For example, if the given argument is:
    [(3, 1, 4),
     (13, 10, 11, 7, 10),
     [1, 2, 3, 4]]
then this function returns 13.

As another example, if the given argument is:
  ([], [-1111111111111111], [])
then this function returns -1111111111111111.

As yet another example, if the given argument is:
  ([], [], [])
then this function returns None.

Preconditions:
  :type seq_seq: (list, tuple)
and the given argument is a sequence of sequences,
where each subsequence contains only numbers.
def largest_number(seq_seq):
    '\n    Returns the largest number in the subsequences of the given\n    sequence of sequences.  Returns None if there are NO numbers\n    in the subsequences.\n\n    For example, if the given argument is:\n        [(3, 1, 4),\n         (13, 10, 11, 7, 10),\n         [1, 2, 3, 4]]\n    then this function returns 13.\n\n    As another example, if the given argument is:\n      ([], [-1111111111111111], [])\n    then this function returns -1111111111111111.\n\n    As yet another example, if the given argument is:\n      ([], [], [])\n    then this function returns None.\n\n    Preconditions:\n      :type seq_seq: (list, tuple)\n    and the given argument is a sequence of sequences,\n    where each subsequence contains only numbers.\n    '
    x = None
    for j in range(len(seq_seq)):
        for k in range(len(seq_seq[j])):
            x = j
            y = k
    for l in range(len(seq_seq)):
        for o in range(len(seq_seq[l])):
            if (seq_seq[l][o] > seq_seq[x][y]):
                x = l
                y = o
    if (x == None):
        return None
    return seq_seq[x][y]