Reference library

Python Code Samples

Medium snippets you can copy, study, and run in the browser editor.

4 matches
Cloud + Python medium

Mock Route53 change_resource_record_sets in Python

This code demonstrates how to mock AWS Route53 change_resource_record_sets API calls using the botocore Stubber, allowing you to test DNS update logic without touching real infrastructure.

aws route53 boto3
Python 
import boto3
from botocore.exceptions import ClientError

def mock_change_resource_record_sets():
    """Demonstrates Route53 change_resource_record_sets with a mock client."""
    # Create a mock Route53 client
    route53 = boto3.client('route53', region_name='us-east-1', 
                          aws_access_key_id…
14 0 Open
Modern tooling medium

How to Mock a PEP 517 Build Backend in Python

Use unittest.mock.Mock to simulate a PEP 517 backend interface, stub build hooks, and verify calls for package build automation.

pep517 unittest.mock packaging
Python 
import json
from unittest.mock import Mock

# Simulate a PEP 517 backend interface
class Pep517Backend:
    def build_wheel(self, wheel_directory, config_settings=None, metadata_directory=None):
        return f"{wheel_directory}/mock_package-1.0.0-py3-none-any.whl"

    def get_requires_for_build_wheel(self, config_s…
14 0 Open
Testing & modern typing medium

How to Mock and Stub API Calls in Playwright E2E Tests with Python

This code demonstrates how to mock and stub API responses in Playwright end-to-end tests using Python's unittest.mock patch and Playwright's APIRequestContext.

playwright e2e-testing mocking
Python 
import re
from unittest.mock import patch
from playwright.sync_api import sync_playwright

def verify_api_mock(page, mock_url, mock_response):
    with patch("playwright.sync_api.APIRequestContext.get") as mock_get:
        mock_get.return_value.json.return_value = mock_response
        mock_get.return_value.status_co…
14 0 Open
Testing & modern typing medium

How to Use Stubs, Fakes, Spies, and Mocks in Python Testing

Implement four types of test doubles — stubs, fakes, spies, and mocks — as subclasses of a PaymentGateway interface to replace real dependencies during testing.

testing mocks stubs
Python 
class PaymentGateway:
    def charge(self, amount):
        raise NotImplementedError


class StubPaymentGateway(PaymentGateway):
    """Returns a fixed response without any logic."""
    def charge(self, amount):
        return {"success": True, "transaction_id": "stub-12345"}


class FakePaymentGateway(PaymentGatewa…
12 0 Open

Browse by section

Each section groups closely related Python snippets.

Guide: free Python code samples library

Copy-ready Python snippets for learners and developers

PythonSkillset code samples are short, focused examples organised by topic and difficulty. Every snippet is server-rendered HTML — readable by search engines and easy to copy. Open any sample, read the notes, copy the code, then press Try in editor to run it in the browser with Pyodide.

How to use this library

  1. Pick a topic section — strings, lists, files, functions, and more
  2. Open a sample, read How it works, and copy the code block
  3. Run it in the IDE, tweak values, then take a related quiz or tutorial lesson

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.