A very simple sentiment analyst, using Python, TextBlob and Tweepy.
Python 3.5
Tweepy
NumPy
TextBlob
Hint: You may install all this libraries using the command: pip install LIBRARY_NAME
In order to use Twitter's API, you must create an free app on Twitter Apps. After that, copy your consumer key, consumer secret, token and token secret.
If you are a Portuguese speaker, you may also check my post teaching how to build, step by step, your own sentiments analyst. Link: Como criar um Analisador de Sentimentos