28 lines
690 B
Python
28 lines
690 B
Python
# Python Flatten Nested Lists
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# (c) Joe James 2023
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# list comprehension method
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def flatten1 (myList):
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return [i for j in myList for i in j]
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# recursive method
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def flatten2 (myList):
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flatList = []
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for item in myList:
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if isinstance(item, list):
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flatList.extend(flatten2(item))
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else:
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flatList.append(item)
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return flatList
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list1 = [[0], [1, 2], [3, [4, 5]], [6], [7]]
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list2 = [0, [1, 2], [3, [4, 5]], [6], 7]
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print("flatten1(list1): ", flatten1(list1)) # works, but only flattens 1 layer of sublists
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# print(flatten1(list2)) # error - can't work with list of ints and sublists of ints
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print("flatten2(list1): ", flatten2(list1))
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print("flatten2(list2): ", flatten2(list2))
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