Jagged list
Level: Intermediate (score: 3)
Write a function that takes an irregular shaped list of lists and makes it symmetrical by adding a fillvalue to each sublist:
Example:
>>> jagged_list([[1, 1, 1, 1], [0, 0, 0, 0], [1]], fillvalue=1)
[[1, 1, 1, 1], [0, 0, 0, 0], [1, 1, 1, 1]]
Hint: Some functions in the itertools module may be useful.