Python Code Snippets

This page collects short examples that are actually useful in day-to-day Python work.

Loop Through a List

items = ["api", "worker", "scheduler"]

for item in items:
    print(item)

user = {
    "name": "Ava",
    "role": "admin",
    "active": True,
}

print(user["name"])

from collections import Counter

values = ["python", "python", "api", "docs"]
counts = Counter(values)

print(counts)

with open("notes.txt", "r", encoding="utf-8") as file:
    content = file.read()

print(content)

import json

payload = {"status": "ok", "items": 3}

with open("output.json", "w", encoding="utf-8") as file:
    json.dump(payload, file, indent=2)

try:
    value = int("42")
except ValueError:
    value = 0

print(value)

import os

api_key = os.getenv("OPENAI_API_KEY")

if not api_key:
    raise RuntimeError("OPENAI_API_KEY is not set")

numbers = [1, 2, 3, 4, 5, 6]
even_numbers = [number for number in numbers if number % 2 == 0]

print(even_numbers)