Suggestions to improve a code

[GP]

I have a list:
shelves2 =[{'Part No': '1', 'Length': 610.0,  'Width': 50.0},
       {'Part No': '2', 'Length': 2319.0, 'Width': 465.0 },
       {'Part No': '3', 'Length': 5.0,'Width': 465.0}]

The length of shelf is calculated as follows:
 1. Calculate the maximum length of all items in the shelf.
 2. Calculate width of shelf = 610 (in this case).
 3. Length of shelf : maxlength of all items + length ( if it less than width of shelf) or width of other items such that length of shelf  is less than maximum allowed length.

In the above case the length is 2319+50+5 = 2374. I have the following code which generates it correctly but would like to know if there is a better way to write it. I would like to know some smarter way to write the code ( especially if the "for", "if" statements can be avoided).
  list_1=[]
  list_2=[]
  WidthOfShelf = max([x['Width'] for x in shelves2])
  MaxLengthOfItem =  max([x['Length'] for x in shelves2])
  f_LMax=lambda seq, m: [ii for ii in range(0, len(seq)) if seq[ii] ['Length'] >= m][0]
  MaxLengthOfItem_Index =f_LMax(shelves2,MaxLengthOfItem)
  current= MaxLengthOfItem

  list_1=[shelves2[MaxLengthOfItem_Index]]
  list_2 = [MaxLengthOfItem]
  del shelves2[MaxLengthOfItem_Index]
  for i in range(0,len(shelves2)):
       if shelves2[i]['Length'] <= Width:
           if (current + shelves2[i]['Length']) or (current + shelves2  [i]['Width'])<= 2438.5 :
               q_2= min(shelves2[i]['Length'],  shelves2[i]['Width'])
               q=shelves2[i]
               list_1.append(q)
               list_2.append(q_2)
               current += (shelves2[i]['Length'] or shelves2[i]  ['Width'])
               length = sum(list_2)
  print("LENGTH:",length)