Natural Language Processing in Python by Steven Bird, Ewan Klein, and Edward Loper

Natural Language Processing in Python is a foundational open-source book and accompanying NLTK (Natural Language Toolkit) library that teaches computational linguistics and NLP techniques through practical Python programming. Written by renowned linguists Steven Bird, Ewan Klein, and Edward Loper, this resource combines theoretical NLP concepts with hands-on code examples, making it accessible to both beginners and experienced developers. The NLTK library provides essential tools for tokenization, part-of-speech tagging, named entity recognition, sentiment analysis, and more. The free online book serves as both a tutorial and reference guide, featuring interactive examples that run directly in web browsers, allowing learners to experiment with NLP without complex setup. This resource has become a standard in computer science education and is widely used in university courses, professional training, and self-directed learning.