code: def lcumsum (inlist):
      
      newlist = copy.deepcopy(inlist)
      for i in range(1,len(newlist)):
          newlist[i] = newlist[i] + newlist[i-1]
      return newlist
docs: Returns a list consisting of the cumulative sum of the items in the
  passed list.
  
  Usage:   lcumsum(inlist)