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Oct 24, 2013 · 53. The numbers before the bytecodes are offsets into the original binary bytecodes: >>> func.__code__.co_code. 'd\x01\x00}\x00\x00d\x00\x00S'. Some bytecodes come with additional information (arguments) that influence how each bytecode works, the offset tells you at what position in the bytestream the bytecode was found.
- How Python Works
- Inside The Python Virtual Machine
- Accessing and Understanding Python Bytecode
- Putting Bytecode to Use
- Further Reading
Python is often described as an interpreted language—one in which your source code is translated into native CPU instructions as the program runs—but this is only partially correct. Python, like many interpreted languages, actually compiles source code to a set of instructions for a virtual machine, and the Python interpreter is an implementation o...
CPython uses a stack-based virtual machine. That is, it's oriented entirely around stack data structures (where you can "push" an item onto the "top" of the structure, or "pop" an item off the "top"). CPython uses three types of stacks: 1. The call stack. This is the main structure of a running Python program. It has one item—a "frame"—for each cur...
If you want to play around with this, the dis module in the Python standard library is a huge help; the dis module provides a "disassembler" for Python bytecode, making it easy to get a human-readable version and look up the various bytecode instructions. The documentation for the dis modulegoes over its contents and provides a full list of bytecod...
Now that you've read this far, you might be thinking "OK, I guess that's cool, but what's the practical value of knowing this?" Setting aside curiosity for curiosity's sake, understanding Python bytecode is useful in a few ways. First, understanding Python's execution model helps you reason about your code. People like to joke about C being a kind ...
If you'd like to learn more about Python bytecode, the Python virtual machine, and how they work, I recommend these resources: 1. Inside the Python Virtual Machineby Obi Ike-Nwosu is a free online book that does a deep dive into the Python interpreter, explaining in detail how Python actually works. 2. A Python Interpreter Written in Pythonby Allis...
Jun 6, 2024 · Well, understanding bytecode helps you peek under the hood of Python and see how your code works. This knowledge can help you write better, more efficient programs. Even if you don’t see bytecode directly, it’s a crucial part of making Python run smoothly. In this guide, we’ll unravel the mystery of Python bytecode and show you why it ...
Jun 8, 2023 · For example, if you have a Python function defined starting from line 10 in your source code file, and you disassemble the bytecode of that function using the Bytecode object, setting first_line ...
Here's how to view the bytecode of a Python function. import dis. def fib(n): if n <= 2: return 1. return fib(n-1) + fib(n-2) # Display the disassembled bytecode of the function. dis.dis(fib) The function dis.dis in the dis module will return a decompiled bytecode of the function passed to it.
Jun 6, 2024 · Viewing Python Bytecode. Python provides a powerful tool called the dis module (short for “disassembler”) to unveil the bytecode behind your code. This module lets you disassemble Python functions or even entire scripts, revealing the low-level instructions that the Python interpreter executes. Using dis.dis() Let’s start with a simple ...
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Apr 24, 2024 · The dis module in Python allows you to view and inspect the bytecode of your functions, giving you a deeper understanding of how your code is executed. While you don’t need to be an expert in Python bytecode to write effective Python programs, having a basic understanding of it can help you make more informed decisions when optimizing your code and troubleshooting performance issues.
