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Python Code Samples

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

4 matches
Functions & basics easy

Build a Context Manager in Python with contextlib.contextmanager

Create a reusable context manager that safely opens and closes files using the contextlib contextmanager decorator.

context manager contextlib file handling
Python 
from contextlib import contextmanager

@contextmanager
def managed_file(filename, mode='r'):
    """Context manager that opens and closes a file safely."""
    file = open(filename, mode)
    yield file
    file.close()

if __name__ == "__main__":
    # Write a sample file
    with managed_file("sample.txt", "w") as f…
15 0 Open
Files & data easy

How to Read a JSON File into a Dictionary in Python

Load a JSON file into a Python dictionary using the json.load() function with proper file handling and UTF-8 encoding.

json file-io dictionary
Python 
import json
from pathlib import Path

def read_json_file(filepath: str) -> dict:
    """Read a JSON file and return its contents as a dictionary."""
    path = Path(filepath)
    with path.open("r", encoding="utf-8") as f:
        data = json.load(f)
    return data

if __name__ == "__main__":
    # Create a sample JS…
13 0 Open
Files & data easy

Reassemble File Parts into Original File Bytes in Python

Read sorted part files from a directory and concatenate their bytes into the original file.

file handling binary byte concatenation
Python 
import os
import sys
from pathlib import Path

def reassemble_parts(parts_dir: Path, output_path: Path) -> int:
    """
    Reassemble file parts into the original file.

    Args:
        parts_dir: Directory containing the part files
        output_path: Path where the reassembled file will be written

    Returns:
…
12 0 Open
Production deployment patterns easy

How to Build a Simple Data Helper Class in Python

A beginner-friendly DataHelper class that safely saves and loads JSON files with automatic directory creation, perfect for production-style file handling.

json file-handling data-persistence
Python 
from pathlib import Path
import json


class DataHelper:
    """Simple production-style helper for loading and saving JSON data."""

    def __init__(self, data_dir="data"):
        self.data_dir = Path(data_dir)
        self.data_dir.mkdir(exist_ok=True)

    def save(self, filename, data):
        filepath = self.da…
12 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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