input: Write a function to find the largest three numbers in a list. If the list contains less than three numbers, return all the numbers in the list. If the list is empty, return an empty list.
  assert find_largest_three([1, 6, 3, 8, 7, 4])==[6, 7, 8]
  assert find_largest_three([9, 2, 5])==[2, 5, 9]
  assert find_largest_three([1])==[1]
  assert find_largest_three([7, 4])==[4, 7]
  assert find_largest_three([])==[]
output: def find_largest_three(nums):
      if len(nums) == 0:
          return []
      elif len(nums) < 3:
          return sorted(nums)
      else:
          return sorted(nums)[-3:]