human
turn list of lists into one list.
assistant
Here is a Python program to turn a list of lists into one list

import numpy as np

def flatten(l):
    """
    Flattens a list of lists.

    Parameters
    ----------
    l: list
        The list of lists to be flattened.

    Returns
    -------
    list
        The flattened list.

    """
    return [item for sublist in l for item in sublist]

# Enter the list of lists
list_of_lists = [[1,2,3],[4,5,6],[7,8,9]]

# Calling the function
print((flatten(list_of_lists)))

#Example Output
# [1, 2, 3, 4, 5, 6, 7, 8, 9]

#Remember to inspect code for bugs.