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More than 20 years have passed since I authored the Python Essential Reference. At that time, Python was a much smaller language and it came with a useful set of batteries in its standard library. It was something that could mostly fit in your brain. The Essential Reference reflected that era. It was a small book that you could take with you to write some Python code on a desert island or inside a secret vault. Over the three subsequent revisions, the Essential Reference stuck with this vision of being a compact but complete language reference—because if you’re going to code in Python on vacation, why not use all of it? Today, more than a decade since the publication of the last edition, the Python world is much different. No longer a niche language, Python has become one of the most popular programming languages in the world. Python programmers also have a wealth of information at their fingertips in the form of advanced editors, IDEs, notebooks, web pages, and more. In fact, there’s probably little need to consult a reference book when almost any reference material you might want can be conjured to appear before your eyes with the touch of a few keys. If anything, the ease of information retrieval and the scale of the Python universe presents a different kind of challenge. If you’re just starting to learn or need to solve a new problem, it can be overwhelming to know where to begin. It can also be difficult to separate the features of various tools from the core language itself. These kinds of problems are the rationale for this book. Python Distilled is a book about programming in Python. It’s not trying to document everything that’s possible or has been done in Python. Its focus is on presenting a modern yet curated (or distilled) core of the language. It has been informed by my years of teaching Python to scientists, engineers, and software professionals. However, it’s also a product of writing software libraries, pushing the edges of what makes Python tick, and finding out what’s most useful.