convert sub list to list code example
Example 1: python flat list from list of list
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)
Example 2: flatten a list of lists python
flattened = [val for sublist in list_of_lists for val in sublist]