從http://www.pm25.com/shenzhen.html抓取北京，深圳，上海，廣州，成都的pm2.5指數(shù)，并按照空氣質(zhì)量從優(yōu)到差排序，保存在txt文檔里

代碼如下：#coding=utf-8

from?selenium?import?webdriver

from?time?import?sleep

class?PM:

def?__init__(self):

self.dr?=?webdriver.Chrome()

self.pm25_info?=?self.get_pm25_info()

def?get_pm25_info(self):

city_list?=?['beijing','shenzhen','shanghai','guangzhou','chengdu']

pm_info_list?=?[]

i?=?0

while?i?

self.dr.get('http://www.pm25.com/'+city_list[i]+'.html')

sleep(3)

city_name?=?self.dr.find_element_by_css_selector('.bi_loaction_city').text?#定位城市名字

pm_exp?=?self.dr.find_element_by_css_selector('.pm25_span').text?#定位PM2.5指數(shù)

air_num?=?self.dr.find_element_by_css_selector('.bi_aqiarea_num').text?#定位AQI指數(shù)

air_quality?=?self.dr.find_element_by_css_selector('.bi_aqiarea_right?span').text?#定位空氣質(zhì)量描述

pm_info_list.append((city_name,?pm_exp,?air_num,?air_quality))

i?+=?1

pm_info_list.sort(key=lambda?x:float(x[2]))?#按AQI指數(shù)排序(AQI指數(shù)決定了空氣質(zhì)量的優(yōu)良)

return?pm_info_list

def?get_pm_info_file(self):

self.file_title?=?'北上廣深成五地PM2.5數(shù)據(jù)信息'

self.file?=?open(self.file_title?+?'.txt',?'wb')

self.floor?=?1

for?item?in?self.pm25_info:

separate_line?=?'**********'?+?'TOP'?+?str(self.floor)?+?'**********\n'

self.file.write(separate_line.encode('utf-8'))

self.file.write(('城市：'?+?item[0]?+?'\n'

'PM2.5指數(shù)：'?+?item[1]?+?'?'+?'微克/立方米'?+?'\n'

'AQI指數(shù)：'?+?item[2]?+?'\n'

'空氣質(zhì)量：'?+?item[3]+?'\n').encode('utf-8'))

self.floor?+=?1

self.file.close()

def?quit(self):

self.dr.quit()

if?__name__?==?'__main__':

pm_info?=?PM()

pm_info.get_pm_info_file()

pm_info.quit()

網(wǎng)頁如下：

生成txt如下：

總結(jié)

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