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First: recursive flattening based on isinstance solution in Clear category for Flatten a List by leggewie
# use yield rather than return to conserve ressources on recursions
def flatten(array):
it = iter(array)
for iteritem in it:
if isinstance(iteritem, list):
for f in flatten(iteritem):
yield f
else:
yield iteritem
def flat_list(array):
return [el for el in flatten(array)]
June 2, 2021
