Reduse Sum

items = [800,1000,1000,800,800,800,1000,800]
lst=[]
s=0
for k in range(0, len(items)):
    if k==0:
        lst.Add(items[k])
        s+=items[k]
    else:
        lst.Add(items[k]+s)
        s+=items[k]
OUT = lst