Reference library

Python Code Samples

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

3 matches
Functions & basics easy

How to Load a .env File Manually in Python

Parse a .env-style key-value file into a Python dictionary using only the standard library, with comment and quoted-value handling.

dotenv environment-variables file-parsing
Python 
import re
from pathlib import Path


def load_dotenv_file(filepath: str) -> dict[str, str]:
    """Parse a .env-style file into a dictionary."""
    env = {}
    path = Path(filepath)

    if not path.exists():
        raise FileNotFoundError(f"Environment file not found: {filepath}")

    for line in path.read_text()…
13 0 Open
Functions & basics easy

How to Read Environment Variables in Python with Default Values

Retrieve an environment variable safely using os.getenv() with a fallback default when the variable is missing.

environment-variables os configuration
Python 
import os

database_url = os.getenv("DATABASE_URL", "postgresql://localhost:5432/mydb")
print(f"Database URL: {database_url}")
11 0 Open
Errors & debugging easy

How to Debug Print Behind a DEBUG Environment Flag in Python

Create a debug_print function that only outputs when the DEBUG environment variable is set to a truthy value like 1, true, yes, or on.

debugging environment-variables logging
Python 
import os


def debug_print(*args, **kwargs):
    """Print only when DEBUG environment variable is set to a truthy value."""
    if os.environ.get("DEBUG", "").lower() in ("1", "true", "yes", "on"):
        print(*args, **kwargs)


if __name__ == "__main__":
    # Example usage: run as `DEBUG=1 python script.py` to se…
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.