Hi,
I wrote this wrong recursive function that flattens a list:
def flatten(lst, acc=[]):
#print 'acc =', acc, 'lst =', lst
if type(lst) != list:
acc.append(lst)
else:
for item in lst:
flatten(item)
return acc
a = [1, 2, [3, 4, 5], [6, [7, 8, [9, 10], 11], 12], 13, 14]
b = flatten(a)
print b
I was amazed to realize that it flattens the list alright. Why? 'acc'
should be an empty list on each invocation of flatten, but is seems to
accumulate anyway...
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