New Async syntax in python 3.5 example

async.py

import asyncio


class AsyncIterator:

    def __init__(self, data):
        self.data = data

    async def __aiter__(self):
        return self

    async def __anext__(self):
        try:
            return next(self.data)
        except StopIteration:
            raise StopAsyncIteration


async def hello():
    a_map = map(lambda x: x * 2, [1, 2, 3, 4])
    a_iter = AsyncIterator(a_map)
    async for x in a_iter:
        print(x)

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