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solution 4 #14

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18 changes: 18 additions & 0 deletions projects/004-flatten-a-list/python/main.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,18 @@
def flatten_a_list(unflattened_list):

if not unflattened_list:
return unflattened_list

else:

if isinstance(unflattened_list[0], list):
l1 = flatten_a_list(unflattened_list[0])
l2 = flatten_a_list(unflattened_list[1:])

return l1 + l2

else:
l1 = [unflattened_list[0]]
l2 = flatten_a_list(unflattened_list[1:])

return l1 + l2