python 运行报Process finished with exit code 0

import requests
from lxml import etree

def download_one_page(url):
resp = requests.get(url)
html = etree.HTML(resp.text)
resp.encoding = "utf-8"
table = html.xpath("""//*[@id="ulTableBody"]""")[0]
trs = table.xpath("./tr")
for tr in trs:
txt = tr.xpath("./td/text()")
print(txt)

if name == 'main':
download_one_page("http://www.xinfadi.com.cn/index.html%22)

Process finished with exit code 0
就表示正常退出
你没有什么代码阻塞着让程序不许退出，那代码执行完了可不就退出了吗