@staticmethod
def read_serial_numbers_from_file(file='serial_numbers.txt') ->list:
    """ Get the list of all Tello serials numbers from the given file.
        Blank lines and lines that start with "#" will be skipped, so you can add labels/notes about which drone is which

        :param file: The file containing the list of serial numbers; default: 'serial_numbers.txt'
        """
    serials = list()
    with open(file, 'r') as serial_numbers:
        for serial_number in serial_numbers:
            serial_number = ''.join(serial_number.split())
            if serial_number == '' or serial_number[0] == '#':
                continue
            serials.append(serial_number)
    return serials
