>>> data = [['a', 'b', 'c'], ['aaaaaaaaaa', 'b', 'c'], ['a', 'bbbbbbbbbb', 'c']]

>>> col_width = max(len(word) for row in data for word in row) + 2  # padding
>>> for row in data:
...     print "".join(word.ljust(col_width) for word in row)
a            b            c
aaaaaaaaaa   b            c
a            bbbbbbbbbb   c