Answers for "list of list into list python"

flatten a list of lists python

flattened = [val for sublist in list_of_lists for val in sublist]

convert list of list to list python

merged = list(itertools.chain.from_iterable(list2d))

flatten lists python

flat_list = []
for sublist in l:
    for item in sublist:
        flat_list.append(item)