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