Python Code & Libraries
Scikit-Learn is easily the most important machine learning library in Python. It contains almost every possible algorithm, and its interface is being reused by many libraries out there.
Pandas offers a lot of great data manipulation tools. It is a great package when it comes to reading and writing data to files in plenty of formats.
NLTK is a deeply comprehensive natural language processing library. As opposed to SpaCy, it keeps a high focus on modularity and offers users a lot of freedom.