Brian Allen Vanderburg II wrote:
def flatten(x):
res = []
for el in x:
if isinstance(el,list):
res.extend(flatten(el))
else:
res.append(el)
return res
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
Hmm why should it be more efficient? extend operation should not be very
costly?
Regards,
mk
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