def read_file(filepath):
	"""
	for a given file, change it into list of words and numbers, will call this in build_trie

	Parameters
	----------
	filepath: Name of the file we will use

	Return
	------
	a list of words and a list of corresponding weights


	"""
	file = open(filepath, 'r',encoding = "utf-8")
	data = file.readlines()
	data_list = []
	for i in range(len(data)):
		if i != 0:
			data_list.append(data[i])
	num_list = []
	word_list = []
	for l in data_list:
		if l != '\n':
			entry = l.split('\t')
			num_list.append(int(entry[0]))
			word_list.append(entry[1][:-1])
	return num_list,word_list