Python PEP – Everything You Need to Know about it



This tutorial teaches everything you need to know about the Python PEP including what it is a detailed list of PEPs, a cheat sheet, and the pros and cons of using it.

1. What is the Python PEP?

PEP stands for “Python Enhancement Proposal.” It is a document that outlines a proposed new feature, improvement, or change to the Python programming language.

The PEP process is the primary mechanism for proposing major changes to Python, and it provides a framework for the community to discuss and evaluate proposals. Anyone can submit a PEP, and the Python community reviews and discusses the proposal before a decision is made whether to accept or reject it.

PEPs can cover a wide range of topics, from new syntax and language features to library modules and standardization of coding conventions. PEPs are typically written in plain text or reStructuredText, and they follow a standard template that includes sections such as “Abstract,” “Motivation,” “Specification,” and “References.”

Python PEPs can be found on the Python website in the PEP Index, which provides a comprehensive list of all the PEPs that have been accepted, rejected, or are still under consideration.

2. Detailed list of Python PEP

Here is a more detailed list of some of the most important and influential Python Enhancement Proposals (PEPs) over the years:

  • PEP 8: Style Guide for Python Code. This PEP provides guidelines for writing Python code that is consistent, readable, and easy to maintain. It covers topics such as naming conventions, code layout, and programming practices.
  • PEP 20: The Zen of Python. This PEP outlines the guiding principles of the Python language and its community, including simplicity, readability, and the importance of practicality over purity.
  • PEP 257: Docstring Conventions. This PEP provides guidelines for writing documentation strings (docstrings) that describe the purpose, usage, and behavior of Python modules, functions, classes, and methods.
  • PEP 484: Type Hints. This PEP introduces a syntax for adding optional type hints to Python code, which can be used by static type checkers to catch common errors before code is run.
  • PEP 3101: Advanced String Formatting. This PEP introduces a powerful new syntax for formatting strings in Python, which makes it easier to write complex output such as tables, reports, and emails.
  • PEP 3333: Python Web Server Gateway Interface v1.0. This PEP defines a standard interface between Python web frameworks and web servers, which makes it easier to write web applications that can run on any server that supports the WSGI protocol.
  • PEP 498: Literal String Interpolation. This PEP introduces a simpler syntax for formatting strings in Python, which allows expressions to be embedded directly in string literals using a new f-string syntax.
  • PEP 572: Assignment Expressions. This PEP introduces a new syntax for assigning a value to a variable as part of a larger expression, which makes it easier to write concise, readable code in some situations.
  • PEP 3107: Function Annotations. This PEP introduces a syntax for adding optional annotations to Python function signatures, which can be used to document the expected types of arguments and return values, as well as for other purposes such as automatic API generation and debugging.

There are many other PEPs that cover a wide range of topics, including language syntax, standard library modules, and coding conventions. You can find a complete list of all Python Enhancement Proposals on the Python website at

3. What are the pros and cons of using the Python PEP?

Here are some pros and cons of using the Python Enhancement Proposal (PEP) process:


  1. Community input: The PEP process is open to anyone, which means that the Python community can propose, discuss, and collaborate on new features and changes to the language.
  2. Consistency and clarity: By following the guidelines and recommendations in the PEPs, developers can ensure that their code is consistent and easy to read and maintain. This is especially important in large, collaborative projects where multiple developers may be working on the same codebase.
  3. Stability and predictability: The PEP process ensures that changes to the language are carefully considered and evaluated, which helps to maintain the stability and predictability of the language over time. This is particularly important in production environments where stability and reliability are critical.
  4. Flexibility and innovation: The PEP process allows for innovation and experimentation in the language, while also ensuring that new features and changes are introduced in a controlled and manageable way. This helps to keep Python relevant and responsive to changing needs and use cases.
  5. Documentation and education: The PEPs serve as a valuable resource for learning and understanding Python, and they provide a consistent and authoritative reference for best practices, guidelines, and standards.


  1. Slow process: The PEP process can be slow and time-consuming, especially for larger or more complex proposals. This can sometimes lead to frustration and delays in the development process.
  2. Incomplete or outdated proposals: Not all PEPs are accepted, and some proposals may be incomplete or outdated. This can sometimes lead to confusion or inconsistency in the language.
  3. Complexity: The PEP process can be complex and intimidating for newcomers, which may discourage some developers from participating in the community and contributing to the language.
  4. Limited scope: The PEP process is focused on changes to the Python language itself, and does not address issues related to third-party libraries, frameworks, or tools.

Overall, the benefits of the PEP process outweigh the drawbacks, and it remains an important part of the Python ecosystem. However, it’s important to recognize the limitations and challenges of the process and to approach it with a clear understanding of its strengths and weaknesses.

4. PEP Python Naming Conventions Cheat Sheet

Here is a cheat sheet of the most common Python naming conventions:

  1. Variable names: Use lowercase words separated by underscores, e.g. my_variable. Avoid using single letters as variable names.
  2. Function names: Use lowercase words separated by underscores, e.g. my_function(). Avoid using single letters as function names.
  3. Class names: Use CamelCase (capitalizing the first letter of each word) for class names, e.g. MyClass.
  4. Module names: Use lowercase words separated by underscores for module names, e.g.
  5. Constant names: Use all uppercase words separated by underscores for constant names, e.g. MY_CONSTANT.
  6. Private variable and function names: Use a leading underscore to indicate that a variable or function is intended to be private, e.g. _my_private_variable.
  7. Protected variable and function names: Use a leading underscore to indicate that a variable or function is intended to be protected, e.g. self._my_protected_variable.
  8. Public variable and function names: No special notation is needed for public variable and function names, but follows the general naming conventions.

Remember that these naming conventions are not strict rules, but rather common conventions used in the Python community to make code more readable and consistent.

5. Conclusion

In conclusion, this tutorial has provided a comprehensive overview of the Python PEP (Python Enhancement Proposal) process, including its purpose, benefits, and drawbacks. By exploring the detailed list of PEPs and providing a cheat sheet, users can gain a deeper understanding of the PEP process and how to use it effectively. While the PEP process can be time-consuming and may involve significant effort, it ultimately leads to higher-quality code, better collaboration, and increased standardization within the Python community. By familiarizing themselves with the PEP process and its associated tools, users can stay up-to-date with the latest advancements in Python development and contribute to the community’s ongoing success. Overall, this tutorial is a valuable resource for any Python developer looking to improve their coding practices and participate in the broader Python community.