>>> import requests >>> from bs4 import BeautifulSoup def fetch_data(url: str) -> dict: response = requests.get(url, timeout=10) response.raise_for_status() return response.json() class DataProcessor: def __init__(self, source): self.source = source self._cache = {} @property def is_ready(self) -> bool: return bool(self._cache) with open('data.csv') as f: rows = [line.strip() for line in f] result = [x**2 for x in range(10) if x % 2 == 0] >>> print(f"Total: {len(result)} items")