計(jì)算密集型-->需要占用大量的CPU資源-->多進(jìn)程
IO密集型-->需要網(wǎng)絡(luò)功能，大量時間都在等待網(wǎng)絡(luò)數(shù)據(jù)的到-->多線程、協(xié)程
進(jìn)程、線程的調(diào)用由操作系統(tǒng)覺得，攜程的調(diào)用由開發(fā)者自己決定

協(xié)程實(shí)現(xiàn)

import time

def A():
    while True:
        print("----A---")
        yield #函數(shù)里邊包含yield 為生成器
        time.sleep(0.5)

def B(c):
    while True:
        print("----B---")
        c.next()
        time.sleep(0.5)

if __name__=='__main__':
    a = A()
    B(a)

greenlet

from greenlet import greenlet
import time


def test1():
    while True:
        print('------A-------')
        gr2.switch()
        time.sleep(0.5)


def test2():
    while True:
        print('------B-------')
        gr1.switch()
        time.sleep(0.5)


gr1 = greenlet(test1)
gr2 = greenlet(test2)

gr1.switch()

gevent

import gevent


def f(n):
    for i in range(n):
        print(gevent.getcurrent(), i)

        gevent.sleep(1)


g1 = gevent.spawn(f, 5)
g2 = gevent.spawn(f, 5)
g3 = gevent.spawn(f, 5)
g1.join()
g2.join()
g3.join()