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What are Python PEP Documents (example: PEP 3147)

 

What Are Python PEP Documents?

PEP stands for Python Enhancement Proposal.

A PEP is a design document that describes:

  • New features or changes in Python
  • Design decisions
  • Best practices
  • Information about the Python community or processes

PEPs serve as the primary channel for proposing and discussing new features or improvements to Python.

PEP Structure

A PEP typically includes:

  • PEP Number (e.g., PEP 3147)
  • Title
  • Author(s)
  • Status (Accepted, Rejected, Final, etc.)
  • Abstract (Summary of the proposal)
  • Motivation
  • Specification
  • Rationale
  • Reference Implementation

Example PEP: PEP 3147

PEP 3147: PYC Repository Directories

 What does it do? It introduced a new system for storing .pyc files (compiled bytecode files) in a dedicated folder called __pycache__.

Before PEP 3147 (Python 3.1 and earlier):

  • Bytecode files were stored directly in the same directory as the source files like:
module.py
module.pyc

After PEP 3147 (Python 3.2+):

  • Bytecode files are stored inside a __pycache__ directory:
module.py
__pycache__/
    module.cpython-310.pyc

This makes directories cleaner and easier to manage across multiple Python versions.

Why Are PEPs Important?

  • They provide transparency into the decision-making process.
  • Anyone can propose new features.
  • They ensure that the community agrees on changes before they are implemented.

Popular PEPs You Should Know:

PEP Number Description Status
PEP 8 Python Style Guide Final
PEP 20 Zen of Python Informational
PEP 257 Docstring Conventions Final
PEP 484 Type Hints Final
PEP 572 Assignment Expressions (:=) Final

How to Find PEPs?

All PEPs are publicly available on the official Python website:  https://peps.python.org/


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