Python Program to Flatten a Nested List using Recursion

# Python program to flatten a nested list
# explicit function to flatten a
# nested list
def flattenList(nestedList):
    # check if list is empty
    if not(bool(nestedList)):
        return nestedList
     # to check instance of list is empty or not
    if isinstance(nestedList[0], list):
        # call function with sublist as argument
        return flattenList(*nestedList[:1]) + flattenList(nestedList[1:])
    # call function with sublist as argument
    return nestedList[:1] + flattenList(nestedList[1:])
# Driver Code
nestedList = [[8, 9], [10, 11, 'geeks'], [13]]
print('Nested List:\n', nestedList)
print("Flattened List:\n", flattenList(nestedList))

# Python program to flatten a nested list
# explicit function to flatten a
# nested list
def flattenList(nestedList):
    # check if list is empty
    if not(bool(nestedList)):
        return nestedList
     # to check instance of list is empty or not
    if isinstance(nestedList[0], list):
        # call function with sublist as argument
        return flattenList(*nestedList[:1]) + flattenList(nestedList[1:])
    # call function with sublist as argument
    return nestedList[:1] + flattenList(nestedList[1:])
# Driver Code
nestedList = [['A', 'B', 'C'], ['D', 'E', 'F']]
print('Nested List:\n', nestedList)
print("Flattened List:\n", flattenList(nestedList))

# Python program to flatten a nested list
# explicit function to flatten a
# nested list
def flattenList(nestedList):
    # check if list is empty
    if not(bool(nestedList)):
        return nestedList
     # to check instance of list is empty or not
    if isinstance(nestedList[0], list):
        # call function with sublist as argument
        return flattenList(*nestedList[:1]) + flattenList(nestedList[1:])
    # call function with sublist as argument
    return nestedList[:1] + flattenList(nestedList[1:])
# Driver Code
nestedList = [[1], [2], [3], [4], [5]]
print('Nested List:\n', nestedList)
print("Flattened List:\n", flattenList(nestedList))