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Python function `flatten_nested_list(nested_list)
Create a Python function flatten_nested_list(nested_list) that takes a list of lists (which may contain other nested lists) and returns a single flattened list containing all the elements in a depth-first order. Example: python Example input: nested_list = [1, [2, [3, 4], 5], 6, [7, 8, [9, [10]]]] Expected output: flattened_list = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] Constraints:
The input list can contain integers, other lists, or both.
The function should handle arbitrarily deep nesting.
You are not allowed to use Python's built-in itertools.chain or similar built-in functions for flattening the list. Test Cases: python Test Case 1: assert flatten_nested_list([1, 2, [3, 4], [5, [6, 7]]]) == [1, 2, 3, 4, 5, 6, 7] Test Case 2: assert flatten_nested_list([[], [1], [[2, 3]], [4, [5, []]]]) == [1, 2, 3, 4, 5] Test Case 3: assert flatten_nested_list([[[[1, 2], 3], 4], 5, [], [6, [7, [8, [9]]]]]) == [1, 2, 3, 4, 5, 6, 7, 8, 9] Write the flatten_nested_list function that passes all the above test cases.
To create a function that flattens a nested list in Python, we can use recursion to handle the depth-first order of the elements. Below is the implementation of the flatten_nested_list function, along with some test cases to ensure its correctness.
def flatten_nested_list(nested_list):
flattened_list = []
for element in nested_list:
if isinstance(element, list):
# Recursively extend the flattened list with the flattened version of the current element
flattened_list.extend(flatten_nested_list(element))
else:
# Append the element directly if it's not a list
flattened_list.append(element)
return flattened_list
# Test Cases
assert flatten_nested_list([1, 2, [3, 4], [5, [6, 7]]]) == [1, 2, 3, 4, 5, 6, 7]
assert flatten_nested_list([[], [1], [[2, 3]], [4, [5, []]]]) == [1, 2, 3, 4, 5]
assert flatten_nested_list([[[[1, 2], 3], 4], 5, [], [6, [7, [8, [9]]]]]) == [1, 2, 3, 4, 5, 6, 7, 8, 9]
print("All test cases passed!")
Explanation of the Code:
- Function Definition: The function flatten_nested_list is defined to take one parameter nested_list, which can be a list containing integers and/or other lists.
- Flattening Process: We initialize an empty list flattened_list to collect the flattened elements.
- Iteration: We iterate through each element in nested_list.- If an element is a list (checked using isinstance), we call the function recursively on that element and extend flattened_list with the result.
- If the element is not a list (i.e., it’s an integer), we simply append it to flattened_list.
- Return Statement: Finally, we return flattened_list which now contains all elements in a single flat structure.
Test Cases:
The test cases provided check various scenarios:
1. A mix of integers and nested lists.
2. Lists with empty sub-lists.
3. Deep nesting to ensure that the function handles all levels correctly.
When you run this code, you should see "All test cases passed!" if everything is working correctly.