input: Write a function to find the largest three numbers in a list. The function should return a list containing the three largest numbers in descending order. If the list has fewer than three numbers, it should return as many numbers as it contains.
  assert find_largest_three([1, 6, 3, 8, 7, 4])==[8, 7, 6]
  assert find_largest_three([9, 5])==[9, 5]
  assert find_largest_three([2, 4, 6])==[6, 4, 2]
  assert find_largest_three([10])==[10]
  assert find_largest_three([])==[]
output: def find_largest_three(nums):
      return sorted(nums, reverse=True)[:3]