python - Dryscrape 形式和抓取问题

Question

我正在尝试提交表单并检索一些数据使用 dryscrape 但当我执行程序时，出现错误:

Traceback (most recent call last):
   File "easyjettest.py", line 22, in <module>
     originairport_field.set(originairport)
AttributeError: 'NoneType' object has no attribute 'set'

我真的不知道问题出在哪里。我已阅读文档并在网上尽可能多地进行搜索。

代码如下:

import dryscrape
import sys

if 'linux' in sys.platform:
   # start xvfb in case no X is running. Make sure xvfb 
   # is installed, otherwise this won't work!
   dryscrape.start_xvfb()

originairport = 'Cyprus (Larnaca) LCA'
destinationairport = 'London Gatwick LGW'
odate = '16/08/2016'
adate = '18/08/2016'
adults = '1'

sess = dryscrape.Session(base_url = 'http://www.easyjet.com/en/')

sess.set_attribute('auto_load_images', False)

sess.visit('/')

originairport_field = sess.at_xpath('.//*[@id="acOriginAirport"]')
originairport_field.set(originairport)
destinationairport_field = sess.at_xpath('.//*           [@id="acDestinationAirport"]')
destinationairport_field.set(destinationairport)
odate_field = sess.at_xpath('.//*[@id="oDate"]')
odate_field.set(odate) 
rdate_field = session.at_xpath('.//*[@id="rDate"]')
rdate_field.set(rdate)
adults_field = session.at_xpath('.//*[@id="numberOfAdults"]')
adults_field.set(adults) 
originairport_field.form().submit()

# extract all links
for link in session.xpath('//a[@href]'):
  print link['href']

Answer 1

检查发生错误的行，可能是变量 originairport_field、destinationairport_field、odate_field 、rdate_field,adults_field 未指定任何值。

顺便问一下，您设置 rdate_field 和 adults_field 值的行中的 session 来自哪里？这不是sess

编辑:

根据您更新的错误信息，可能 sess.at_xpath('.//*[@id="acOriginAirport"]') 不会返回任何内容。