Python: Reverse each list in a given list of lists

Last update on April 19 2025 12:58:44 (UTC/GMT +8 hours)

Reverse Each List in Nested Lists

Write a Python program to reverse each list in a given list of lists.

Sample Solution:

Python Code:

# Define a function 'reverse_list_lists' that reverses each list within a list of lists
def reverse_list_lists(nums):
    # Iterate through each sublist 'l' in the 'nums' list
    for l in nums:
        # Sort each sublist 'l' in reverse order
        l.sort(reverse=True)
    return nums

# Create a list of lists 'nums'
nums = [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12], [13, 14, 15, 16]]

# Print a message indicating the original list of lists
print("Original list of lists:")
print(nums)

# Print a message indicating the operation to reverse each list
print("\nReverse each list in the said list of lists:")
# Call the 'reverse_list_lists' function with 'nums' and print the result
print(reverse_list_lists(nums))

Sample Output:

Original list of lists:
[[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12], [13, 14, 15, 16]]

Reverse each list in the said list of lists:
[[4, 3, 2, 1], [8, 7, 6, 5], [12, 11, 10, 9], [16, 15, 14, 13]]

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to reverse a nested list while preserving order.
Write a Python program to sort each sublist in a nested list.
Write a Python program to flatten and reverse a nested list.
Write a Python program to reverse elements only in even-positioned lists.

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