Tokenization code: A1.py

1.enter command line interface:
$ pip3 install nltk matplotlib

2.Enter Python 3 environment and download corpus
>>> import nltk
>>> nltk.download()

3.In order to demo the result, I randomly select a business with business_id:PEnMU_He_qHoCfdoAKmjDQ(line 23)
Comment line 23 and uncomment line 22 to get random every run time