协程

import asyncio  # python3.5添加的
import time

def f1():
    time.sleep(1)

def work1():
    for i in range(5):
        f1()

# 协同函数
# 异步的操作（不必排队、不必等待的操作）
async def f2():
    asyncio.sleep(1)

# 协同函数
async def work2():
    await f2()

import asyncio
async def compute(x, y):
    print("Compute %s + %s ..." % (x, y))
    await asyncio.sleep(1.0)
    return x + y
async def print_sum(x, y):
    result = await compute(x, y)
    print("%s + %s = %s" % (x, y, result))
loop = asyncio.get_event_loop()
loop.run_until_complete(print_sum(1, 2))
loop.close()