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Oct 24, 2013 · The LOAD_CONST bytecode (ASCII d, hex 64) is followed by two additional bytes encoding a reference to a constant associated with the bytecode, for example. As a result, the STORE_FAST opcode (ASCII } , hex 7D) is found at index 3.
Oct 12, 2020 · Python runs programs by compiling them into bytecode, an instruction set used to drive its interpreter. With the "dis" module, you can disassemble and examine bytecode from any Python...
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Feb 25, 2024 · Python provides several tools and modules for developers to interact with and inspect Bytecode, the most notable being the dis module. Using dis , developers can disassemble Python functions and inspect the generated Bytecode for analysis and optimization purposes.
- 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 8, 2023 · Python’s dis module is essential for decomposing bytecode into individual instructions, which enables programmers to examine code behavior, spot performance snags, and resolve difficult...
Apr 24, 2024 · Understanding how bytecode works and how Python generates it can provide valuable insights into the inner workings of the Python interpreter. By analyzing the bytecode generated by your code, you can identify inefficiencies, optimize your code, and improve its performance.
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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.
