python3 异步模块asyncio

时间 2019-11-09

标签 python3 python 异步模块 asyncio 栏目 Python 繁體版

原文原文链接

yield方法引入，python

这里存在的问题是，若是你想建立从0到1,000,000这样一个很大的序列，你不得不建立能容纳1,000,000个整数的列表。async

可是当加入了生成器以后，你能够不用建立完整的序列，你只须要可以每次保存一个整数的内存便可。oop

import asyncio

@asyncio.coroutine
def countdown(number, n):
    while n > 0:
        yield from asyncio.sleep(1)
        print("T-minus", n, "({})".format(number))
        n -= 1
        if n == 10 and number=="A":
            raise ValueError

loop = asyncio.get_event_loop()

tasks = [
    asyncio.ensure_future(countdown("A", 20)),
    asyncio.ensure_future(countdown("B", 33)),
]
loop.run_until_complete(asyncio.wait(tasks))

loop.close()

看代码spa

import asyncio

@asyncio.coroutine
def countdown(number, n):
    while n > 0:
        yield from asyncio.sleep(1)
        print("T-minus", n, "({})".format(number))
        n -= 1
        if n == 10 and number=="A":
            raise ValueError

loop = asyncio.get_event_loop()

tasks = [
    asyncio.ensure_future(countdown("A", 20)),
    asyncio.ensure_future(countdown("B", 33)),
]
loop.run_until_complete(asyncio.wait(tasks))

loop.close()

原理讲的特别好code

http://python.jobbole.com/86481/orm