Flatten list

flatten_list.py

from typing import List, Any

def flatten_list(list_of_lists: List[List[Any]]) -> List[Any]:
    """Merge/flatten a list of lists into one single list.
    Example: [[1, 2, 3],[4, 5, 6]] --> [1, 2, 3, 4, 5, 6]

    Args:
        list_of_lists (List[list]): List of lists to be merged/flattened. 

    Returns:
        list: Flattened list.
    """
    return [item for sublist in list_of_lists for item in sublist]