这个小 Python 脚本提高了对低级编程的理解

# 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()