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