input: Write a function to delete all duplicates in a given list of numbers and return the list with unique elements only.
  def deleteDuplicates(list):
      final_list = []
      for num in list:
          if num not in final_list:
              final_list.append(num)
      return final_list
  assert deleteDuplicates([1, 2, 3, 2, 4, 3, 5]) == [1, 2, 3, 4, 5]
  assert deleteDuplicates([4, 4, 4, 4]) == [4]
  assert deleteDuplicates([]) == []
  assert deleteDuplicates([5, 6, 7, 8]) == [5, 6, 7, 8]
output: def deleteDuplicates(list):
      final_list = []
      for num in list:
          if num not in final_list:
              final_list.append(num)
      return final_list