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Author: joeyajames

flatten_list.py

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