Reference library

OOP & classes

Classes, instances, methods, dataclasses, and object-oriented design in Python.

1 match
OOP & classes easy

How to Build an In-Memory CRUD Repository Class in Python

Define a Python Repository class that stores objects in a dictionary and supports create, read, update, delete, and list operations.

repository crud oop
Python 
class Repository:
    def __init__(self):
        self._data = {}

    def create(self, key, value):
        self._data[key] = value
        return key

    def read(self, key):
        return self._data.get(key)

    def update(self, key, value):
        if key not in self._data:
            raise KeyError(f"Key '{ke…
14 0 Open

Browse by section

Each section groups closely related Python snippets.

OOP & classes — Python code examples

What you will find here

This page collects oop & classes snippets — short, copy-ready Python you can paste into our free online IDE and run without installing anything. Each sample includes a plain-English explanation and the full source code.

Samples vs tutorials and challenges

Samples are quick reference — one concept per page. For step-by-step teaching, use our Python tutorials. To test yourself, try quizzes or coding challenges. Clean up style with the Python formatter.

Related coding tools

Free online Python IDE Write and run Python in your browser — no install. Free Python code formatter Format with autopep8 — side-by-side PEP 8 cleanup. Python code samples Copy-ready snippets to study and run in the IDE.