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Python Code Samples

Copy-ready Python snippets by topic and difficulty — short, focused, and runnable in the browser editor.

28 matches
Comprehensions & generators easy

How to filter even numbers with a Python list comprehension

Build a new list of only the even numbers from 1 to 20 using a single list comprehension with a filter condition.

list comprehension even numbers filtering
Python 
even_numbers = [num for num in range(1, 21) if num % 2 == 0]
print(even_numbers)
12 0 Open
Comprehensions & generators easy

List Comprehension to Filter Even Numbers in Python

Creates a new list containing only the even numbers from an existing list using a list comprehension with a condition.

list comprehension filtering even numbers
Python 
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
even_numbers = [n for n in numbers if n % 2 == 0]
print(f"Original: {numbers}")
print(f"Even numbers: {even_numbers}")
13 0 Open
Data pipelines & processing easy

How to Filter Data in Python

Filter a list of dictionaries by exact key-value matches or numerical ranges using concise list comprehensions.

filtering list-comprehension dictionaries
Python 
from typing import List, Dict, Any


def filter_data(
    data: List[Dict[str, Any]], key: str, value: Any
) -> List[Dict[str, Any]]:
    """Return records where data[key] equals value."""
    return [record for record in data if record.get(key) == value]


def filter_by_range(
    data: List[Dict[str, Any]], key: str…
12 0 Open
Cloud + Python easy

How to mock EC2 describe-instances tag filtering in Python

Simulate AWS EC2 describe-instances with tag-based filtering using a mock dataset and conditional list comprehension.

ec2 mock aws
Python 
import json
from datetime import datetime, timezone


def mock_describe_instances(tag_key: str, tag_value: str) -> list[dict]:
    """Simulate EC2 describe-instances with tag filtering."""
    all_instances = [
        {"InstanceId": "i-0abc123", "State": "running", "Tags": [{"Key": "Name", "Value": "web-server"}, {"K…
15 0 Open

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  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

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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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