python中的wait和gather的用处和区别_协程的wait和gather区别

python中的wait和gather的用处和区别

asyncio中的wait和gather的用处和区别
wait等待协程执行完成后才会执行下一句

import asyncio
async def get_html(url):
    print(f'start get {url}')
    await asyncio.sleep(2)
    print(f'end get {url}')


if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    tasks = [get_html("https://www.baidu.com") for i in range(10)]
    loop.run_until_complete(asyncio.wait(tasks))
    loop.close()

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gather的用法和区别

import asyncio

async def get_html(url):
    print(f'start get {url}')
    await asyncio.sleep(2)
    print(f'end get {url}')


if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    group1 = [get_html("https://www.baidu.com") for i in range(10)]
    group2 = [get_html("https://www.google.com") for i in range(8)]
    group1 = asyncio.gather(*group1)
    group2 = asyncio.gather(*group2)
    loop.run_until_complete(asyncio.gather(group1, group2))
    loop.close()

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gather更加high-level，gather可以将tasks分组