Python writer.writerow（data）ValueError：关闭文件上的I / O操作[关闭]

Question

为什么我会收到错误valueerror:I/O operation on closed file？

import urllib2
import csv


from bs4 import BeautifulSoup

url = "http://www.tendersinfo.com/rss/index.php?sector_name=0202&notice_type=1,2,3,7,10,11,16,8"

with open('tender.csv', 'w') as csvfile:
    fieldnames = ['TITLE', 'LINK', 'DESCRIPTION']
    writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
    writer.writeheader()
    writer = csv.writer(csvfile, delimiter=',')

    resource = urllib2.urlopen(url)
    url = resource.read()
    soup = BeautifulSoup(url)
    soup.prettify()

    title = soup.find_all('title')
    link = soup.find_all('link')
    description = soup.find_all('description')

listIterator = []
listIterator[:] = range(2, 16)
for i in listIterator:
    data = [[title[i].get_text('')]]
    writer.writerow(data)

这里是错误：

C:\Python27\python.exe D:/PycharmProjects/tenderinfo/tendorinfo.py Traceback（最近一次通话最后一次）：文件 “D:/PycharmProjects/tenderinfo/tendorinfo.py”，第 32 行，在 writer.writerow(data) ValueError: I/O operation on closed file

进程以退出代码 1 结束

我需要废弃该链接并将其放入 csv 文件中。请帮忙。

Answer 1

这是一个缩进问题。将最后一个块移动到with 正文下：

with open('tender.csv', 'w') as csvfile:
    # ...

    # the following block should also be under "with" since it uses "writer"
    # which writes to csvfile that needs to be opened for writing at this moment
    listIterator = []
    listIterator[:] = range(2, 16)
    for i in listIterator:
        data = [[title[i].get_text('')]]
        writer.writerow(data)