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Python Code Samples

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

55 matches
Concurrency & performance easy

How to Validate Data with ThreadPoolExecutor in Python

This code shows how to validate a list of numbers concurrently using ThreadPoolExecutor, dramatically speeding up slow validation tasks by running them in parallel threads.

concurrency threadpool validation
Python 
import time
from concurrent.futures import ThreadPoolExecutor
from dataclasses import dataclass


@dataclass
class Result:
    is_valid: bool
    value: int


def validate(value: int) -> Result:
    time.sleep(0.1)  # simulate slow validation (API call, DB check)
    return Result(is_valid=0 < value < 100, value=value…
13 0 Open
Testing & modern typing easy

Generate Fake User Data with Faker in Python

Use the Faker library to generate realistic fake user profiles with names, emails, phone numbers, and addresses for tests or demos.

faker fake-data testing
Python 
from faker import Faker

fake = Faker()

def generate_user():
    return {
        "name": fake.name(),
        "email": fake.email(),
        "phone": fake.phone_number(),
        "address": fake.address().replace("\n", ", "),
    }

if __name__ == "__main__":
    user = generate_user()
    for key, value in user.ite…
10 0 Open
Testing & modern typing easy

How to Compare Floats in pytest with approx

Uses pytest.approx to compare floating-point numbers with tolerance, avoiding precision issues.

pytest floating-point testing
Python 
import pytest

def test_float_addition():
    result = 0.1 + 0.2
    expected = 0.3
    assert result == pytest.approx(expected)
13 0 Open
Testing & modern typing easy

How to Test Hypotheses with Property-Based Check in Python

A Python search that checks an integer property (palindrome divisible by digit sum) and returns the first counterexample within a range, with exactly reproduced output from the code.

hypothesis testing palindrome
Python 
def is_property_satisfied(n):
    """
    Demonstrates a mathematically inspired property:
    checks whether n is both a palindrome and divisible by its digit sum.
    """
    s = str(n)
    if s != s[::-1]:
        return False
    digit_sum = sum(int(d) for d in s)
    return digit_sum != 0 and n % digit_sum == 0

…
10 0 Open
Streaming & messaging easy

How to Implement a Priority Queue for Messages in Python

Build a message priority queue with heapq and dataclasses that pops messages by priority, using sequence numbers to keep insertion order.

priority-queue heapq dataclass
Python 
import heapq
from dataclasses import dataclass, field
from typing import Any

@dataclass(order=True)
class Message:
    priority: int
    sequence: int = field(compare=False)
    content: str = field(compare=False)

class PriorityQueue:
    def __init__(self):
        self._heap = []

    def push(self, priority: int,…
15 0 Open
Streaming & messaging easy

How to Simulate a Micro-Batch Interval Trigger in Python

A dataclass-based mock that emits batch numbers at fixed intervals, mimicking a micro-batch streaming scheduler for testing and development.

streaming mock dataclass
Python 
import time
from dataclasses import dataclass, field
from typing import List, Callable


@dataclass
class MicroBatchTriggerMock:
    batch_interval_seconds: float = 0.5
    max_batches: int = 5
    _batches_emitted: int = 0
    _next_emit_time: float = field(init=False, default=0)

    def start(self, on_batch: Callab…
13 0 Open
Streaming & messaging easy

Sliding Window Average with Deque in Python

Computes the running average of a sliding window over streaming numbers using a collections.deque for O(1) pop-left operations.

sliding-window deque streaming
Python 
from collections import deque

class SlidingAverage:
    def __init__(self, window_size):
        self.window_size = window_size
        self.window = deque()
        self.total = 0

    def add(self, value):
        self.window.append(value)
        self.total += value
        if len(self.window) > self.window_size:
…
13 0 Open

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