Python Bytecode Explained | How Python Compiles & Executes Code Internally |day 5

In this video, we deep dive into Python bytecode, a crucial internal concept that explains how Python source code is converted into an executable form. Understanding bytecode helps Data Engineers debug performance issues, understand execution behavior, and answer Python internals questions confidently in interviews.

We clearly explain what bytecode is, how it is generated, where it is stored, and how it is executed by the Python Virtual Machine.

🔥 What You Will Learn

• What is Python bytecode
• Why Python uses bytecode
• Is Python compiled or interpreted? (bytecode perspective)
• How Python source code is compiled to bytecode
• Role of the Python interpreter (CPython)
• .pyc files explained
• _pycache_ folder purpose
• When bytecode is generated and reused
• How Python Virtual Machine (PVM) executes bytecode
• Bytecode vs machine code
• How bytecode impacts performance
• Real-world relevance in Data Engineering jobs
• Interview-ready explanation of Python bytecode

This session is part of the Python for Data Engineering Playlist, designed for Data Engineers who want strong Python internals before working on Spark, Airflow, ETL pipelines, and cloud systems.