当我听到有关线程和 urllib3 的一些好消息时,我正在寻找一种方法来优化我的代码。显然,人们不同意哪种解决方案是最好的。
下面我的脚本的问题是执行时间:太慢了!
Step 1: 我获取此页面
Step 2:我用 BeautifulSoup 解析页面
Step 3:我把数据放在excel文档中
Step 4:我对我列表中的所有国家(大列表)一次又一次地这样做
(我只是将网址中的“阿富汗”更改为另一个国家)
这是我的代码:
ws = wb.add_sheet("BULATS_IA") #We add a new tab in the excel doc
x = 0 # We need x and y for pulling the data into the excel doc
y = 0
Countries_List = ['Afghanistan','Albania','Andorra','Argentina','Armenia','Australia','Austria','Azerbaijan','Bahrain','Bangladesh','Belgium','Belize','Bolivia','Bosnia and Herzegovina','Brazil','Brunei Darussalam','Bulgaria','Cameroon','Canada','Central African Republic','Chile','China','Colombia','Costa Rica','Croatia','Cuba','Cyprus','Czech Republic','Denmark','Dominican Republic','Ecuador','Egypt','Eritrea','Estonia','Ethiopia','Faroe Islands','Fiji','Finland','France','French Polynesia','Georgia','Germany','Gibraltar','Greece','Grenada','Hong Kong','Hungary','Iceland','India','Indonesia','Iran','Iraq','Ireland','Israel','Italy','Jamaica','Japan','Jordan','Kazakhstan','Kenya','Kuwait','Latvia','Lebanon','Libya','Liechtenstein','Lithuania','Luxembourg','Macau','Macedonia','Malaysia','Maldives','Malta','Mexico','Monaco','Montenegro','Morocco','Mozambique','Myanmar (Burma)','Nepal','Netherlands','New Caledonia','New Zealand','Nigeria','Norway','Oman','Pakistan','Palestine','Papua New Guinea','Paraguay','Peru','Philippines','Poland','Portugal','Qatar','Romania','Russia','Saudi Arabia','Serbia','Singapore','Slovakia','Slovenia','South Africa','South Korea','Spain','Sri Lanka','Sweden','Switzerland','Syria','Taiwan','Thailand','Trinadad and Tobago','Tunisia','Turkey','Ukraine','United Arab Emirates','United Kingdom','United States','Uruguay','Uzbekistan','Venezuela','Vietnam']
Longueur = len(Countries_List)
for Countries in Countries_List:
y = 0
htmlSource = urllib.urlopen("http://www.cambridgeesol.org/institutions/results.php?region=%s&type=&BULATS=on" % (Countries)).read() # I am opening the page with the name of the correspondant country in the url
s = soup(htmlSource)
tableGood = s.findAll('table')
try:
rows = tableGood[3].findAll('tr')
for tr in rows:
cols = tr.findAll('td')
y = 0
x = x + 1
for td in cols:
hum = td.text
ws.write(x,y,hum)
y = y + 1
wb.save("%s.xls" % name_excel)
except (IndexError):
pass
所以我知道一切并不完美,但我期待着在 Python 中学习新东西!该脚本非常慢,因为 urllib2 没那么快,而 BeautifulSoup。对于汤的事情,我想我真的无法让它变得更好,但对于 urllib2,我不能。
编辑1:多处理对 urllib2 没用? https://stackoverflow.com/questions/6905800/multiprocessing-useless-with-urllib2对我来说似乎很有趣。
你们觉得这个潜在的解决方案怎么样?
# Make sure that the queue is thread-safe!!
def producer(self):
# Only need one producer, although you could have multiple
with fh = open('urllist.txt', 'r'):
for line in fh:
self.queue.enqueue(line.strip())
def consumer(self):
# Fire up N of these babies for some speed
while True:
url = self.queue.dequeue()
dh = urllib2.urlopen(url)
with fh = open('/dev/null', 'w'): # gotta put it somewhere
fh.write(dh.read())
编辑2:URLLIB3
谁能告诉我更多有关这方面的事情吗?
对多个请求重复使用同一个套接字连接
(HTTPConnectionPool 和 HTTPSConnectionPool)(可选
客户端证书验证)。https://github.com/shazow/urllib3 https://github.com/shazow/urllib3
至于我为不同页面请求同一网站 122 次,我想重复使用相同的套接字连接可能会很有趣,我错了吗?
不能再快一点吗? ...
http = urllib3.PoolManager()
r = http.request('GET', 'http://www.bulats.org')
for Pages in Pages_List:
r = http.request('GET', 'http://www.bulats.org/agents/find-an-agent?field_continent_tid=All&field_country_tid=All&page=%s' % (Pages))
s = soup(r.data)