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Inside The Python Virtual Machine

You know how to program in Python but are interested in what goes on under the covers of the interpreter? Well, fasten your seat-belts as this book will take you on a tour of  the virtual machine that runs your Python code.

It will describe how Python code is compiled and run, how the language itself can be modified and will demystify the mysterious bytecodes that run on the Python virtual machine.

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About

About

About the Book

Inside the Python Virtual Machine provides a guided tour under the covers of the Python interpreter for the curious pythonista. It attempts to show the user what happens from the moment the user executes a piece of Python code to the point when the interpreter returns the result of executing the piece of code.

This book will provide the readers with an understanding of the various processes that go into compiling and executing a python program removing most of the mystery surrounding how the python interpreter executes source code. The books starts out with a description of the compilation phase with emphasis on the less generic parts of the compilation phase. It then proceeds to discuss python objects and their implementation in CPython. This is followed by a discussion of various objects types that are central to the interpreter such as frame objects and code objects. The process of evaluating code objects by the interpreter loop is also discussed as well as how to extend the Python programming language with your own constructs.

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Author

About the Author

Obi Ike-Nwosu

Obi has more than five years of experience using Python. His interests include but are not limited to algorithms, mathematics, computer security, writing, developmental economics, business and problem solving in general.

Contents

Table of Contents

1.Introduction

2.The View From 30,000ft

3.Compiling Python Source Code

  1. 3.1From Source To Parse Tree
  2. 3.2Python tokens
  3. 3.3From Parse Tree To Abstract Syntax Tree
  4. 3.4Building The Symbol Table
  5. 3.5From AST To Code Objects
  6. Graph Traversal

4.Python Objects

  1. 4.1PyObject
  2. 4.2Dissecting Types
  3. 4.3Type Object Case Studies
  4. 4.4Minting type instances
  5. 4.5Objects and their attributes
  6. 4.6Method Resolution Order (MRO)

5.Code Objects

  1. 5.1Exploring code objects
  2. 5.2Code Objects within other code objects
  3. 5.3Code Objects in the VM

6.Frame Objects

  1. 6.1Allocating Frame Objects

7.Interpreter and Thread States

  1. 7.1The Interpreter state
  2. 7.2The Thread state

8.Intermezzo: The abstract.c Module

9.The evaluation loop, ceval.c

  1. 9.1Putting names in place
  2. 9.2The parts of the machine
  3. 9.3The Evaluation loop
  4. 9.4A sampling of opcodes

10.The Block Stack

  1. 10.1A Short Note on Exception Handling

11.From Class code to bytecode

12.Generators: Behind the scenes.

  1. 12.1The Generator object
  2. 12.2Running a generator

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