PYTHON

python async await

import asyncio

async def print_B(): #Simple async def
    print("B")

async def main_def():
    print("A")
    await asyncio.gather(print_B())
    print("C")
asyncio.run(main_def())

# The function you wait for must include async
# The function you use await must include async
# The function you use await must run by asyncio.run(THE_FUNC())

async, await, python

async def get_chat_id(name):
    await asyncio.sleep(3)
    return "chat-%s" % name

async def main():
    id_coroutine = get_chat_id("django")
    result = await id_coroutine

python async await

import asyncio
from PIL import Image
import urllib.request as urllib2

async def getPic(): #Proof of async def
    pic = Image.open(urllib2.urlopen("https://c.files.bbci.co.uk/E9DF/production/_96317895_gettyimages-164067218.jpg"))
    return pic

async def main_def():
    print("A")
    print("Must await before get pic0...")
    pic0 = await asyncio.gather(getPic())
    print(pic0)
asyncio.run(main_def())

python async await function

async def sleep():
    print(f'Time: {time.time() - start:.2f}')
    await asyncio.sleep(1)

python async await function await expression

import asyncio
import time

from asgiref.sync import sync_to_async


def blocking_function(seconds: int) -> str:
    time.sleep(seconds)
    return f"Finished in {seconds} seconds"

async def main():
    seconds_to_sleep = 5
    function_message = await sync_to_async(blocking_function)(seconds_to_sleep)
    print(function_message)

loop = asyncio.get_event_loop()
loop.run_until_complete(main())
loop.close()