异步调用与回调机制

同步调用与异步调用指提交任务的方式就

同步调用：提交完任务后就在原地等待任务执行完，拿到结果再执行下一步任务，导致程序串行执行

from concurrent.futures import ThreadPoolExecutor
import time,random
def la(name):
    print("%s is laing" % name)
    time.sleep(random.randrange(3,5))
    res=random.randint(3,17)*"#"
    return {'name':name,'res':res}
def weight(shit):
    name=shit['name']
    size=len(shit['res'])
    print("%s la <%s>kg"%(name,size))

if __name__=="__main__":
    pool=ThreadPoolExecutor(10)
    shit1=pool.submit(la,'user1').result()#wait run
    weight(shit1)
    shit2=pool.submit(la,'user2').result()#wait run
    weight(shit2)
    shit3 = pool.submit(la, 'user3').result()  # wait run
    weight(shit3)

异步调用：提交完任务后，不在原地等待任务执行完毕

from concurrent.futures import ThreadPoolExecutor
import time,random
def la(name):
    print("%s is laing" % name)
    time.sleep(random.randrange(3,5))
    res=random.randint(3,17)*"#"
    return {'name':name,'res':res}
def weight(shit):
    shit=shit.result()#result() return func value
    name=shit['name']
    size=len(shit['res'])
    print("%s la <%s>kg"%(name,size))

if __name__=="__main__":
    pool=ThreadPoolExecutor(10)
    pool.submit(la,'user1').add_done_callback(weight)#bind callback func
    pool.submit(la,'user2').add_done_callback(weight)
    pool.submit(la, 'user3').add_done_callback(weight)

user1 is laing
user2 is laing
user3 is laing
user1 la <12>kg
user2 la <14>kg
user3 la <10>kg

阻塞与非阻塞：进程运行的一种状态，同步调用和阻塞没有任何关系。