python async await

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Alycia
21 Jul 2020
1import asyncio
2
3async def print_B(): #Simple async def
4    print("B")
5
6async def main_def():
7    print("A")
8    await asyncio.gather(print_B())
9    print("C")
10asyncio.run(main_def())
11
12# The function you wait for must include async
13# The function you use await must include async
14# The function you use await must run by asyncio.run(THE_FUNC())
15
16
17
source
Michela
03 Oct 2019
1#will sleep the current corutien for set numner of seconds
2import asyncio
3await asyncio.sleep(1)
4
5
source
Rhett
30 Sep 2017
1import asyncio
2await asyncio.sleep(1)
Simon
13 Mar 2017
1import asyncio
2
3async def main():
4    print('Hello ...')
5    await asyncio.sleep(1)
6    print('... World!')
7
8# Python 3.7+
9asyncio.run(main())
10
11# output
12"""
13Hello ...
14...World!
15"""
16# with a 1 second wait time after Hello ...
Violeta
16 Apr 2018
1import asyncio
2from PIL import Image
3import urllib.request as urllib2
4
5async def getPic(): #Proof of async def
6    pic = Image.open(urllib2.urlopen("https://c.files.bbci.co.uk/E9DF/production/_96317895_gettyimages-164067218.jpg"))
7    return pic
8
9async def main_def():
10    print("A")
11    print("Must await before get pic0...")
12    pic0 = await asyncio.gather(getPic())
13    print(pic0)
14asyncio.run(main_def())
Bram
31 Jun 2016
1import signal
2import sys
3import asyncio
4import aiohttp
5import json
6
7loop = asyncio.get_event_loop()
8client = aiohttp.ClientSession(loop=loop)
9
10async def get_json(client, url):
11    async with client.get(url) as response:
12        assert response.status == 200
13        return await response.read()
14
15async def get_reddit_top(subreddit, client):
16    data1 = await get_json(client, 'https://www.reddit.com/r/' + subreddit + '/top.json?sort=top&t=day&limit=5')
17
18    j = json.loads(data1.decode('utf-8'))
19    for i in j['data']['children']:
20        score = i['data']['score']
21        title = i['data']['title']
22        link = i['data']['url']
23        print(str(score) + ': ' + title + ' (' + link + ')')
24
25    print('DONE:', subreddit + '\n')
26
27def signal_handler(signal, frame):
28    loop.stop()
29    client.close()
30    sys.exit(0)
31
32signal.signal(signal.SIGINT, signal_handler)
33
34asyncio.ensure_future(get_reddit_top('python', client))
35asyncio.ensure_future(get_reddit_top('programming', client))
36asyncio.ensure_future(get_reddit_top('compsci', client))
37loop.run_forever()
38
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