python爬蟲提醒IndexError: list index out of range

最近在寫一個(gè)爬蟲程序，但是調(diào)用main()就不停的提示IndexError: list index out of range
可是在子函數(shù)進(jìn)行測試的時(shí)候明明是不存在這個(gè)問題的

代碼如下

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()

報(bào)錯(cuò)類型為
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()這個(gè)函數(shù)進(jìn)行調(diào)試的時(shí)候就不會(huì)報(bào)錯(cuò)
請問這是為什么？
是我主函數(shù)寫的有問題嗎？