最近在写一个爬虫程序，但是调用main()就不停的提示IndexError: list index out of range

可是在子函数进行测试的时候明明是不存在这个问题的

代码如下

from selenium import webdriver

from lxml import etree

from selenium.webdriver.common.by import By

from selenium.webdriver.support.ui import WebDriverWait

from selenium.webdriver.support import expected_conditions as EC

url='http://www.ipe.org.cn/IndustryRecord/Regulatory.aspx'

driver=webdriver.Chrome()

driver.get(url)

def parse_and_save():

s=driver.page_source

ss=etree.HTML(s)

sss=ss.xpath('//*[@id="table_con0"]/div[2]/table/tbody/tr')

with open(r'C:\Users\xiaot\Desktop\IPE.csv','w',encoding='utf-8') as f:

for tr in sss:

name=tr.xpath('./td')[1].text

location=tr.xpath('./td')[2].text+tr.xpath('./td/span')[0].text

year=tr.xpath('./td')[3].text

records=tr.xpath('./td')[4].text

f.write("{},{},{},{}\n".format(name,location,year,records))

def Page_Turner():

WebDriverWait(driver,60000000).until(EC.presence_of_element_located((By.XPATH,'//*[@id="pagination0"]/div/div/div[3]/i[3]')))

driver.find_element_by_xpath('//*[@id="pagination0"]/div/div/div[1]/select/option[4]').click()

WebDriverWait(driver,60000000).until(EC.presence_of_element_located((By.XPATH,'//*[@id="pagination0"]/div/div/div[3]/i[3]')))

parse_and_save()

driver.find_element_by_xpath('//*[@id="pagination0"]/div/div/div[3]/i[3]').click()

WebDriverWait(driver,60000000).until(EC.presence_of_element_located((By.XPATH,'/html/body/div[5]/div[2]/div[2]/div/div[2]/a')))

code=driver.find_element_by_xpath('/html/body/div[5]/div[2]/div[2]/div/div[2]/a')

if code:

while True:

val=driver.find_element_by_xpath('//*[@id="txtCode"]').get_attribute('value')

if val and len(val)==4:

break

pass

pass

driver.find_element_by_xpath('/html/body/div[5]/div[2]/div[2]/div/div[2]/a').click()

def main():

i=1

for i in range(1,3):

Page_Turner()

i+=1

print('It is done!')

main()

报错类型为

File "C:/Users/ttt.py", line 46, in parse_and_save

name=tr.xpath('./td')[1].text

IndexError: list index out of range

可是我在用Page_Turner()这个函数进行调试的时候就不会报错

请问这是为什么？

是我主函数写的有问题吗？