網頁爬蟲 - python的多進程怎麼配合requests
這是單一進程順序執行的程式碼：
import requests,time,os,random
def img_down(url):
with open("{}".format(str(random.random())+os.path.basename(url)),"wb") as fob:
fob.write(requests.get(url).content)
urllist=[]
with open("urllist.txt","r+") as u:
for a in u.readlines():
urllist.append(a.strip())
s=time.clock()
for i in range(len(urllist)):
img_down(urllist[i])
e=time.clock()
print ("time: %d" % (e-s))這是多進程的程式碼：
from multiprocessing import Pool
import requests,os,time,random
def img_down(url):
with open("{}".format(str(random.random())+os.path.basename(url)),"wb") as fob:
fob.write(requests.get(url).content)
if __name__=="__main__":
urllist=[]
with open("urllist.txt","r+") as urlfob:
for s in urlfob.readlines():
urllist.append(s.strip())
s=time.clock()
p=Pool()
for i in range(len(urllist)):
p.apply_async(img_down,args=(urllist[i],))
p.close()
p.join()
e=time.clock()
print ("time: {}".format(e-s))但是單一進程和多進程花費的時間幾乎沒差別，問題大概是requests阻塞IO，請問理解的對不對，程式碼該怎麼修改達到多進程的目的？
謝謝！
