def mimic_dict(filename):
  f = open(filename)
  k = []
  v = []
  d = {}
  for s in f:
      k += s.strip().split()
  klen = len(k)
  def init_lst(lst, cnt):
      while cnt > 0:
          lst.append([])
          cnt -= 1
      return lst
  d = dict(zip(k, init_lst(v, klen)))
  for w in k:
     nwi = k.index(w)+1
     if nwi != klen:
         d[w].append(k[nwi])
  return

>>> dict([(1,2),(1,3),(1,4)])
{1: 4}
>>>