[xgrind@localhost Área de trabalho]$ python
Python 2.7.6 (default, Jun 28 2014, 19:27:51)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> n = [[1,2,3
... ], [4,5,6,7,8,9]]
>>> def flatten(lists):
...     results = []
...     for numbers in range(len(lists)):
...         results.append(lists[numbers])
...     return results
...
>>> print flatten(n)
[[1, 2, 3], [4, 5, 6, 7, 8, 9]]
>>>