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NumPy By Example

A Beginner's Guide to Learning NumPy (updated for NumPy 2)

DAT Linux

The book was designed to introduce NumPy features in a structured way, with each chapter building on your knowledge incrementally. Revised and updated for NymPy 2.

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About

About

About the Book

The material is suitable for the NumPy beginner, although some basic programming knowledge -- preferably Python -- is assumed. It's also assumed you have at least a rudimentary understanding of running shell commands from a terminal on your system of choice. Many courses, especially in data science, have modules or bridging lessons for learning NumPy as a prerequisite. This book would certainly be suitable as support material for this kind of introductory course.

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Computers and ProgrammingData StructuresPythonData Science

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About the Author

DAT Linux

DAT Linux is a Linux distribution for data science. It brings together all your favourite open-source data science tools and apps into a ready-to-run desktop environment. It’s based on Ubuntu, so it’s easy to install and use. The custom DAT Linux Control Panel provides a centralised one-stop-shop for running and managing dozens of data science programs.

Contents

Table of Contents

      • Preface to the 2025 edition
      • About the Book
      • About DAT Linux
    • Chapter 1. Introduction
      • 1.1  What is NumPy?
      • 1.2  Why NumPy is Important
      • 1.3  NumPy as a Base or Integration Library
      • 1.4  Why Learn NumPy?
    • Chapter 2. Getting Started
      • 2.1  Python 3
      • 2.2  Using pip
      • 2.3  Installing NumPy
      • 2.4  Execution Environment
      • 2.5  NumPy First Steps
    • Chapter 3. Array Basics
      • 3.1  Dimensions & Axes
      • 3.2  Data Types
      • 3.3  Compound Types
      • 3.4  Mathematical Constants
      • 3.5  Exercises
    • Chapter 4. Array Creation
      • 4.1  Create Arrays using Python Lists
      • 4.2  Create Empty Arrays
      • 4.3  Create Arrays Filled with Preferred Values
      • 4.4  Create Arrays Filled with Incremental Sequences
      • 4.5  Create Arrays Filled with Random Values using numpy.random
      • 4.6  Array-like objects
      • 4.7  Create Arrays from Other Arrays or Array-like Objects
      • 4.8  Creating Common Matrices (2-D arrays)
      • 4.9  Structured Arrays
      • 4.10  Record arrays
      • 4.11  Other Ways to Create Arrays
      • 4.13  Exercises
    • Chapter 5. Array Inspection
      • 5.1  Shape & Size Information
      • 5.2  Truth Evaluation
      • 5.3  Type Properties
      • 5.4  String Representation
      • 5.5  Exercises
    • Chapter 6. Input & Output
      • 6.1  Persisting & Loading a Single Array
      • 6.2  Persisting & Loading Multiple Arrays
      • 6.3  Write Data to a CSV (text) File
      • 6.4  A Note About File Paths
      • 6.5  Exercises
    • Chapter 7. Array Selection & Modification
      • 7.1  Common Indexing & Slicing: 1-D Arrays
      • 7.2  Common Indexing & Slicing: n-D Arrays
      • 7.3  Fancy Indexing
      • 7.4  Exercises
    • Chapter 8. Array Computation
      • 8.1  Unary Ufuncs — Operating on a Single Array
      • 8.2  Binary Ufuncs
      • 8.3  Broadcasting — Binary Operations with Arrays of Dissimilar Dimension
      • 8.4  Matrix Operations
      • 8.5  Set Operations
      • 8.6  Other Logic Operations
      • 8.7  Statistical Operations
      • 8.8  Exercises
    • Chapter 9. Array Transformation
      • 9.1  Transposing
      • 9.2  Reshaping
      • 9.3  Flattening
      • 9.4  Rotating
      • 9.5  Combining & Splitting
      • 9.6  Sorting
      • 9.7  Exercises
    • Chapter 10. String Arrays
      • 10.1 Common String Processing Operations
      • 10.2 Exercises
    • Appendix A. Virtual Environments & Containers
      • A.1  virtualenv
      • A.2  Docker Containers
    • Appendix B. Python Lists & array Vs NumPy Arrays
      • B.1  Python Lists
      • B.2  The array Array
      • B.3  The Case for (or Against) NumPy Arrays
    • Appendix C. NumPy Function & Property Reference
      • C.1  numpy
      • C.2  numpy.linalg
      • C.3  numpy.fft
      • C.4  numpy.random
      • C.5  numpy.polynomial
      • C.6  numpy.strings
    • Appendix D. Solutions to Exercises
      • D.1  Chapter 3
      • D.2  Chapter 4
      • D.3  Chapter 5
      • D.4  Chapter 6
      • D.5  Chapter 7
      • D.6  Chapter 8
      • D.7  Chapter 9
      • D.8  Chapter 10

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