Write the recursive function flat(aList) that takes a possibly deep list and flattens it. The function should not mutate the original list. Hint: you can check if something is a list by using the built-in functions type() or isinstance [3, [[5, 2, 6, [4]] >>>X flat (x) [3, 5, 2, 6, 4] >>>X [3, [[5, 2, 6, [4]]

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Explanation:

CODE

def flat(aList):

if aList == []:

return aList

if isinstance(aList[0], list):

return flat(aList[0]) + flat(aList[1:])

return aList[:1] + flat(aList[1:])

x = [3, [[5, 2]], 6, [4]]

print(x)

print(flat(x))

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