flatten a list of lists python

flat_list = [item for sublist in l for item in sublist]

flat_list = [item for sublist in l for item in sublist]

#which is equivalent to this 
flat_list = []
for sublist in l:
    for item in sublist:
        flat_list.append(item)

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

list_of_lists = [[180.0], [173.8], [164.2], [156.5], [147.2], [138.2]] 
flattened = [val for sublist in list_of_lists for val in sublist