Nov 7, 2025 · Fundamentals

Mastering Python File Extensions and Their Use Cases

This article explains the purpose and typical usage of various Python file extensions—including .py, .ipynb, .pyi, .pyc, .pyw, and .pyx—provides code examples, demonstrates how to write type‑hint files, and compares pure Python with Cython for performance‑critical tasks.

Cythonfile extensionsperformance

0 likes · 7 min read

Mastering Python File Extensions and Their Use Cases

Satori Komeiji's Programming Classroom

Sep 25, 2024 · Fundamentals

Understanding Python .pyc Files: How They Are Generated, Structured, and Imported

This article explains why and when Python creates .pyc files, shows how to compile them manually with py_compile, demonstrates importing compiled bytecode via importlib, dissects the .pyc file header and payload, and explores the CPython marshal implementation and simple bytecode obfuscation techniques.

ObfuscationPythonbytecode

0 likes · 14 min read

Understanding Python .pyc Files: How They Are Generated, Structured, and Imported