These functions come from goopy:
def flatten1(seq):
"""
Return a list with the contents of SEQ with sub-lists and tuples
"exploded".
This is only done one-level deep.
"""
lst = []
for x in seq:
if type(x) is list or type(x) is tuple:
for val in x:
lst.append(val)
else:
lst.append(x)
return lst
def flatten(seq):
"""
Returns a list of the contents of seq with sublists and tuples "exploded".
The resulting list does not contain any sequences, and all inner sequences
are exploded. For example:
>>> flatten([7,(6,[5,4],3),2,1])
[7,6,5,4,3,2,1]
"""
lst = []
for el in seq:
if type(el) == list or type(el) is tuple:
lst.extend(flatten(el))
else:
lst.append(el)
return lst
Brian Allen Vanderburg II wrote:
mrk...@gmail.com wrote:
Hello everybody,
Any better solution than this?
def flatten(x):
res = []
for el in x:
if isinstance(el,list):
res.extend(flatten(el))
else:
res.append(el)
return res
a = [1, 2, 3, [4, 5, 6], [[7, 8], [9, 10]]]
print flatten(a)
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
Regards,
mk
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I think it may be just a 'little' more efficient to do this:
def flatten(x, res=None):
if res is None:
res = []
for el in x:
if isinstance(el, (tuple, list)):
flatten(el, res)
else:
res.append(el)
return res
Brian Vanderburg II
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