2019独角兽企业重金招聘Python工程师标准>>> 
今天刚看bs4的官方文档，说使用lxml作为解析器比使用内置解析器速度快很多，于是写了个函数测试了一下，但不知道为什么，测试跑出来的结果刚好相反，暂时未找到原因，先做下记录后续继续研究。
from bs4 import BeautifulSoup
import time
from wswp.WebScraping import downloaddef time_test():FIELDS = ('area', 'population', 'iso', 'country', 'capital', 'continent', 'tld', 'currency_code', 'currency_name', 'phone', 'postal_code_format', 'postal_code_regex', 'languages', 'neighbours')NUM_ITERATIONS = 1000 # number of times to test each scraperhtml = download('http://example.webscraping.com/view/Aland-Islands-2')start = time.time()for name in ['html.parser', 'lxml']:for i in range(NUM_ITERATIONS):result = {}soup = BeautifulSoup(html, name)for field in FIELDS:result[field]=soup.find('tr', id='places_%s__row' % field).find('td', class_='w2p_fw').textassert(result['area'] == '1,580 square kilometres')end = time.time()print('%s the time is: %.2f seconds' % (name, (end - start)))time_test()