【12.3】call_soon、call_at、call_later、call_soon_threadsafe

call_soon，即刻执行

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import asyncio


def callback(sleep_times):
    print('sleep {} success'.format(sleep_times))


def stop_loop(loop):
    loop.stop()


if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    # 即刻执行
    loop.call_soon(callback, 2)
    loop.call_soon(stop_loop, loop)
    loop.run_forever()

sleep 2 success

Process finished with exit code 0

call_later，指定时间之后再运行，执行的顺序和指定的时间有关，cal_soon比call_later优先执行

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import asyncio


def callback(sleep_times):
    print('sleep {} success'.format(sleep_times))


def stop_loop(loop):
    loop.stop()


if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    # 指定时间之后再运行
    loop.call_later(1, callback, 1)
    loop.call_later(2, callback, 2)
    loop.call_later(3, callback, 3)
    # loop.call_soon(stop_loop, loop)
    loop.run_forever()

sleep 1 success
sleep 2 success
sleep 3 success

call_at，也是指定时间之后再执行，但是这个时间时loop里面的时间

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import asyncio


def callback(sleep_times, loop):
    print('sleep {} success, loop time {} '.format(sleep_times, loop.time()))


def stop_loop(loop):
    loop.stop()


if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    now = loop.time()
    # 指定时间之后再运行
    loop.call_at(now+1, callback, 1, loop)
    loop.call_at(now+2, callback, 2, loop)
    loop.call_at(now+3, callback, 3, loop)
    # loop.call_soon(stop_loop, loop)
    loop.run_forever()

sleep 1 success, loop time 2861146.171 
sleep 2 success, loop time 2861147.171 
sleep 3 success, loop time 2861148.171