def nestedSplit(astring, sep=None, *subsep):
"""nestedSplit(astring, sep=None, *subsep): given astring, and one or more split
strings, it splits astring hierarchically. The first split key is the higher level one.
Ex.: nestedSplit("a b\nc d", "\n", " ") => [['a', 'b'], ['c', 'd']] """
if subsep:
return [nestedSplit(fragment, *subsep) for fragment in astring.split(sep)]
return astring.split(sep)
if __name__ == '__main__':
st = "a b\nc d"
print st
print nestedSplit(st, "\n", " ")
print
tetris = """\
....
.##.
.##.
....
####
####
..##
..##"""
from textwrap import dedent
tetris = dedent(tetris)
print tetris
print nestedSplit(tetris, "\n\n", "\n")
