String Splitter Brain Teaser

[runsun pan]

For the fans of funtional programming:

>>> s='ATT/GATA/G'
>>> [y.split('/') for y in (' '.join([x for x in s]).replace(' / ',
'/')).split()]
[['A'], ['T'], ['T', 'G'], ['A'], ['T'], ['A', 'G']]