Please help me!

Question

How do I define the function remove_extra_n(drones) that takes in a list of drones and returns a new list, containing only 1 occurrence of each item. The order of appearance should be based on the first time each drone occurs.

Answer 1

Define the function is_magic_square(matrix) that will take in a list of lists.
If the square is magic, return True, otherwise return False.

A square is magic if each cell contains a different integerand the sum of the integers in each row, column and diagonal is equal.

matrix: an N by N list of lists.
1x1 e.g. [[1]]
3x3 e.g. [[4,9,2],[3,5,7],[8,1,6]]
4x4 e.g. [[7,12,1,14],[2,13,8,11],[16,3,10,5],[9,6,15,4]]

For example, 
is_magic_square([[1]])
should return True.

is_magic_square([[1,2],[3,4]])
should return False.

Answer 2

print(list(list(set(drones)).sort()))