Here is a YouTube video featuring Sentiment Analysis in Python Using Natural Language Tool Kit, and is part of a growing collection of videos I have found to be useful. The reason is for walking you through the best way to clean, analyze and categorize your text data in Python with NLTK and refining your workflow when creating Python applications.
This tutorial, "Sentiment Analysis in Python Using Natural Language Tool Kit" is free education you can watch, which will help you deepen your knowledge and be better prepared for IT certification exams, schoolwork, or using Python in a business.