How to use the pycantonese.read_corpus function in pycantonese

#!/usr/bin/python
# coding: utf-8

import pycantonese as pc # assuming pycantonese.py is in the same directory

##----------------------------------------------------------------------------##
## read corpus data

dataPath = 'data_sample' # the folder "data_sample" (which has data_sample.txt)
                         # is in the same directory as this script
currentCorpus = pc.read_corpus(dataPath)

##----------------------------------------------------------------------------##
## customized functions

def printListUTF8(stringlist):
    for word in stringlist:
        try:
            print unicode(word, encoding='utf-8')
        except:
            print repr(word)

def final_tone(corpus, what_final_tone):
    final = what_final_tone[: -1]
    tone = what_final_tone[-1]
    return pc.search_jp(corpus, [(final, 2), (tone, 3)], 'type')