def read_data_from_file(filename):
	"""
		Description:
			read data from a file

		Args:
			filename: the name of the file to be read

		Returns:
			a data_list that store all needed data, 2 dimension
	"""

	data_list = []
	with open(filename, 'r') as f_read:
		for line in f_read:
			if line.find('#') >= 0: continue
			#注意文件分隔符！
			tmp_list = list(filter(None, line.strip().split(' ')))
			data_list.append(tmp_list)
	
	return data_list