async_examples.py

import asyncio
import datetime
import random

async def display_date(num, loop):
    end_time = loop.time() + 50.0
    while True:
        print("Loop: {} Time: {}".format(num, datetime.datetime.now()))
        if (loop.time() + 1.0) >= end_time:
            break
        await asyncio.sleep(random.randint(0, 5))

loop = asyncio.get_event_loop()
 
asyncio.ensure_future(display_date(1, loop))
asyncio.ensure_future(display_date(2, loop))
 
loop.run_forever()

#############################

import asyncio
import requests

async def main():
    loop = asyncio.get_event_loop()
    future1 = loop.run_in_executor(None, requests.get, 'http://www.google.com')
    future2 = loop.run_in_executor(None, requests.get, 'http://www.google.co.uk')
    response1 = await future1
    response2 = await future2
    print(response1.text)
    print(response2.text)

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

#############################

import asyncio

@asyncio.coroutine
def slow_operation(future):
    yield from asyncio.sleep(1)
    future.set_result('Future is done!')

loop = asyncio.get_event_loop()
future = asyncio.Future()
asyncio.ensure_future(slow_operation(future))
loop.run_until_complete(future)
print(future.result())
loop.close()

#############################

import asyncio

@asyncio.coroutine
def factorial(name, number):
    f = 1
    for i in range(2, number+1):
        print("Task %s: Compute factorial(%s)..." % (name, i))
        yield from asyncio.sleep(1)
        f *= i
    print("Task %s: factorial(%s) = %s" % (name, number, f))

loop = asyncio.get_event_loop()
tasks = [
    asyncio.ensure_future(factorial("A", 2)),
    asyncio.ensure_future(factorial("B", 3)),
    asyncio.ensure_future(factorial("C", 4))]
loop.run_until_complete(asyncio.wait(tasks))
loop.close()