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Python Code Samples

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

3 matches
Modern tooling medium

How to Bind and Mock structlog Context in Python

Shows how to bind persistent key-value context to a structlog logger, unbind keys, and mock the logger in tests to verify context is passed correctly.

structlog logging mocking
Python 
import structlog
from unittest.mock import patch

logger = structlog.get_logger()

def demo():
    logger = structlog.get_logger()
    logger = logger.bind(user_id=42, request_id="abc123")
    logger.info("user logged in", action="login")
    
    # Unbind a key
    logger = logger.unbind("user_id")
    logger.info("r…
17 0 Open
Caching & Redis medium

How to Implement a Redis-Like Cache Dictionary in Python

Build a RedisMockDict class that mimics basic Redis key-value operations with TTL support, expiry cleanup, and standard dict-like methods.

redis cache ttl
Python 
from collections import OrderedDict
import time

class RedisMockDict:
    def __init__(self, ttl=None):
        self._data = OrderedDict()
        self._ttl = ttl  # default TTL in seconds, None = no expiry
        self._expiry = {}

    def set(self, key, value, ttl=None):
        """Set a key-value pair with optiona…
12 0 Open
Database scaling & optimization medium

Simulate a GIN Index for JSONB in Python

Build a mock Generalized Inverted Index (GIN) that flattens JSON documents into key-value tokens for fast lookup queries, mimicking PostgreSQL JSONB indexing.

jsonb gin-index inverted-index
Python 
import json
import random
from collections import defaultdict

# Mock GIN (Generalized Inverted Index) for JSONB key-value pairs
class GINIndex:
    def __init__(self):
        self.posting_lists = defaultdict(list)  # token -> list of doc_ids
    
    def index(self, doc_id, json_obj):
        """Index a JSON documen…
14 0 Open

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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.

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  3. Run it in the IDE, tweak values, then take a related quiz or tutorial lesson

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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.

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