Spinner asyncio

spinner_async.py

import sys
import asyncio

@asyncio.coroutine
def spin():
    write, flush = sys.stdout.write, sys.stdout.flush
    for char in itertools.cycle('|/-\\'):
        msg = char + ' loading ...'
        write(msg)
        flush()
        write('\x08' * len(msg))
        try:
            yield from asyncio.sleep(.1)
        except asyncio.CancelledError:
            break  
    write(' ' * len(msg) + '\x08' * len(msg))

@asyncio.coroutine
def slow_func():
    yield from asyncio.sleep(5)
    return True

@asyncio.coroutine
def supervisor():
    signal = Signal()
    spinner = asyncio.async(spin())
    result = yield from slow_func()
    spinner.cancel()
    return result

loop = asyncio.get_event_loop()
result = loop.run_until_complete(supervisor())
loop.close()
print(f'Result: {result}')