Reference library

Python Code Samples

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

4 matches
AI & LLM integration patterns medium

How to Build a Data Helper for LLM Prompts in Python

A beginner-friendly helper class that flattens nested dictionaries, formats prompt templates, and safely parses JSON for AI/LLM pipelines.

llm prompt-engineering data-prep
Python 
import json
from typing import Any, Dict, List, Optional


class DataHelper:
    """Simple helper class for working with data in AI/LLM pipelines."""
    
    def __init__(self, data: Optional[Dict[str, Any]] = None) -> None:
        self.data = data or {}
    
    def flatten(self, prefix: str = "") -> Dict[str, Any]…
17 0 Open
Caching & Redis medium

How to Validate and Cache Data with Redis in Python

A beginner-friendly helper that validates email, phone, and age data and caches validated entries in Redis for 5 minutes.

redis caching validation
Python 
import redis
import json
from functools import wraps

class DataValidator:
    def __init__(self, host="localhost", port=6379, db=0):
        self.cache = redis.Redis(host=host, port=port, db=db)
        self.validators = {
            "email": lambda v: "@" in v and "." in v.split("@")[-1],
            "phone": lambd…
15 0 Open
Database scaling & optimization medium

Database Helper in Python with SQLite Scaling Optimization

Build a beginner-friendly SQLite database helper class with WAL, indexed queries, and efficient batch inserts for scaling.

sqlite database scalability
Python 
import sqlite3
from contextlib import contextmanager


class DatabaseHelper:
    """Beginner-friendly helper for SQLite database operations with scaling tips."""

    def __init__(self, db_path):
        self.db_path = db_path

    @contextmanager
    def connection(self):
        """Context manager for automatic comm…
14 0 Open
Auth & security at scale medium

How to Hash Passwords and Authenticate Users in Python

A beginner-friendly dataclass-based design that hashes passwords with PBKDF2 and verifies them securely using constant-time comparisons.

security password hashing pbkdf2
Python 
import hashlib
import hmac
import secrets
from dataclasses import dataclass
from typing import Optional


@dataclass
class User:
    id: int
    username: str
    password_hash: str
    salt: str


def hash_password(password: str) -> tuple[str, str]:
    salt = secrets.token_hex(16)
    password_hash = hashlib.pbkdf2_…
16 0 Open

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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.

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