asyncio await not recognized in coroutine

Question

I'm working with a simple Python script to get my head wrapped around the asyncio module. I'm going through the documentation which can be found here

However, I noticed that my installation of Python 3 (version 3.5.3, installed on a raspberry pi) does not recognize async def, but will recognize @asyncio.coroutine. Thus, my script has changed from the tutorial code to:

import asyncio
import datetime

@asyncio.coroutine
def display_date(loop):
    end_time = loop.time() + 5.0
    while True:
        print(datetime.datetime.now())
        if (loop.time() + 1.0) >= end_time:
            break
        await asyncio.sleep(1)

loop = asyncio.get_event_loop()
# Blocking call which returns when the display_date() coroutine is done
loop.run_until_complete(display_date(loop))
loop.close()

However, I'm running into syntax errors at await asyncio.sleep(1). Is there any reason for this?? It runs fine on my ubuntu machine (which has python 3.5.1)

Answer 1

await is allowed inside async def function only.

Old-styled coroutines marked by @asyncio.coroutine decorator should use yield from syntax.

You have Python 3.5.1, so just use new syntax, e.g.:

import asyncio import datetime

async def display_date(loop):
    end_time = loop.time() + 5.0
    while True:
        print(datetime.datetime.now())
        if (loop.time() + 1.0) >= end_time:
            break
        await asyncio.sleep(1)

loop = asyncio.get_event_loop()
# Blocking call which returns when the display_date() coroutine is done
loop.run_until_complete(display_date(loop))
loop.close()