annoying.py

CHUNK_WIDTH = 32

class Point(object):
	def __init__(self, x, y, z):
		self.x = x
		self.y = y
		self.z = z

	def to_index(self):
		return point.x + point.y * CHUNK_WIDTH + point.z * CHUNK_WIDTH * CHUNK_WIDTH

	@classmethod
	def from_index(cls, index):
		return cls(
			index % CHUNK_WIDTH,
			(index // CHUNK_WIDTH) % CHUNK_WIDTH,
			index // (CHUNK_WIDTH * CHUNK_WIDTH),
		)

	def __repr__(self):
		return "Point(x=%s, y=%s, z=%s)" % (self.x, self.y, self.z)

	def __equals__(self, other):
		return self.x == other.x and self.y == other.y and self.z == other.z

	def __hash__(self):
		return hash((self.x, self.y, self.z))

for index in xrange(CHUNK_WIDTH ** 3):
	point = Point.from_index(index)
	assert point.to_index() == index

assert len({Point.from_index(index) for index in xrange(CHUNK_WIDTH ** 3)}) == CHUNK_WIDTH ** 3

print "Good"