Asyncio Documentation Documentation, Release 0.0
Note: Depending on your platform, the Python 3 interpreter could be invoked by python instead. This is the case
for conda on Windows for example.
Install aiohttp in the virtual environment:
./venv/bin/python -m pip install -U aiohttp
1.3 Hello World
This is a series of examples showing the basics of how to write coroutines and schedule them in the asyncio event
loop.
1.3.1 Simple coroutine
This example uses the asyncio.AbstractEventLoop.run_until_complete() method to schedule a sim-
ple function that will wait one second, print hello and then finish.
Because it is launched with asyncio.AbstractEventLoop.run_until_complete(), the event loop itself
will terminate once the coroutine is completed.
import asyncio
async def say(what, when):
await asyncio.sleep(when)
print(what)
loop = asyncio.get_event_loop()
loop.run_until_complete(say('hello world', 1))
loop.close()
1.3.2 Creating tasks
This second example shows how you can schedule multiple coroutines in the event loop, and then run the event loop.
Notice that this example will print second_hello before first_hello, as the first task scheduled waits longer
that the second one before printing.
Also note that this example will never terminate, as the loop is asked to run_forever.
import asyncio
async def say(what, when):
await asyncio.sleep(when)
print(what)
loop = asyncio.get_event_loop()
loop.create_task(say('first hello', 2))
loop.create_task(say('second hello', 1))
(continues on next page)
1.3. Hello World 3
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