from numpy import empty, arange

class something:
	def __init__(self):
		self.list=[]

class bench:
	def __init__(self):
		self.sizeX = 1024
		self.sizeY = 1024
		self.data=empty((self.sizeX,self.sizeY),something)
		for x in range(self.sizeX):
			for y in range(self.sizeY):
				self.data[x,y]=something()

	def test(self):
		for x in range(self.sizeX):
			for y in range(self.sizeY):
				if len(self.data[x,y].list)!=0:
					print('Non Empty element')

x=bench()

x.test()