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# ch10/example2.py

import asyncio

import time

async def count_down(name, delay):

indents = (ord(name) - ord('A')) * '\t'

n = 3

while n:

await asyncio.sleep(delay)

duration = time.perf_counter() - start

print('-' * 40)

print('%.4f \t%s%s = %i' % (duration, indents, name, n))

n -= 1

loop = asyncio.get_event_loop()

tasks = [

loop.create_task(count_down('A', 1)),

loop.create_task(count_down('B', 0.8)),

loop.create_task(count_down('C', 0.5))

]

start = time.perf_counter()

loop.run_until_complete(asyncio.wait(tasks))

print('-' * 40)

print('Done.')