Write a function to flatten a list. The list contains other lists, strings, or i
ID: 3790396 • Letter: W
Question
Write a function to flatten a list. The list contains other lists, strings, or ints. For example, [[i, ' a', ['cat'], 2], [[[3]], 'dog'], 4, 5] is flattened into [i, 'a', 'cat', 2, 3, 'dog', 4, 5] (order matters). def flatten(aList): aList: a list Returns a copy of a List, which is a flattened version of a List Paste your entire function, including the definition, in the box below. Do not leave any debugging print statements. Note that we ask you to write a function only - you cannot rely on any variables defined outside your function for your code to work correctly.Explanation / Answer
aList=[[1,[[2]],[[[3]]]],[['4'],{5:5}]]
def flatten(aList):
if aList == []:
return aList
if isinstance(aList[0], list):
return flatten(aList[0]) + flatten(aList[1:])
return aList[:1] + flatten(aList[1:])
print flatten(aList)
Here , we are recursively calling the function flatten, which will take the input as the list and give us an output of the flattened list.