# source: https://github.com/talkpython/async-techniques-python-course/blob/master/src/09-built-on-asyncio/the_unsync/thesync.py  import datetime import math import asyncio import aiohttp import requests from unsync import unsync  def main():     t0 = datetime.datetime.now()      tasks = [         compute_some(),         compute_some(),         compute_some(),         download_some(),         download_some(),         download_some_more(),         download_some_more(),         wait_some(),         wait_some(),         wait_some(),         wait_some(),     ]      [t.result() for t in tasks]      dt = datetime.datetime.now() - t0     print(f"Synchronous version done in {dt.total_seconds():,.2f} seconds.")  @unsync(cpu_bound=True) def compute_some():     print("Computing...")     for _ in range(1, 10_000_000):         math.sqrt(25 ** 25 + .01)  @unsync() async def download_some():     print("Downloading...")     url = 'https://talkpython.fm/episodes/show/174/coming-into-python-from-another-industry-part-2'     async with aiohttp.ClientSession(connector=aiohttp.TCPConnector(ssl=False)) as session:         async with session.get(url) as resp:             resp.raise_for_status()             text = await resp.text()     print(f"Downloaded (more) {len(text):,} characters.")  @unsync() def download_some_more():     print("Downloading more ...")     url = 'https://pythonbytes.fm/episodes/show/92/will-your-python-be-compiled'     resp = requests.get(url)     resp.raise_for_status()     text = resp.text     print(f"Downloaded {len(text):,} characters.")  @unsync() async def wait_some():     print("Waiting...")     for _ in range(1, 1000):         await asyncio.sleep(.001)  if __name__ == "__main__":     main()