I'm not sure if I understand the task correctly, but here is my solution in Python:
def function(lst):
new_lst = []
for i in range(len(lst)-6):
new_lst.append(sum(lst[i:i+6]))
return new_lst
Or you can use map and it looks like this:
def function2(lst):
new_lst = list(map(sum, [lst[i:i+6] for i in range(len(lst)-6)]))
return new_lst
Hope this helps