Seating.py

class Chair(object):
    """Individual chair within the aircraft"""

    def __init__(self, price=25):
        self.price = price
        self.occupied = False

    def purchase(self):
        self.occupied = True


class Aircraft(object):
    """Aircraft that contains seats"""

    def __init__(self, rows=25, wide=6):
        self.rows = [[Chair() for seat in xrange(wide)] for row in xrange(rows)]


    def get_chairs(self):
        chairs = list()
        for row in self.rows:
            for chair in row:
                chairs.append(chair)
        return chairs

    chairs = property(get_chairs)

if __name__ == '__main__':
    plane = Aircraft()
    print len(plane.chairs)