Python2.7为什么我只写了一行列表文件而不是整个列表
Python2.7为什么我只写了一行列表文件而不是整个列表
提问于 2016-12-21 05:57:52
最初，我的代码是：
# encoding = utf-8
from bs4 import BeautifulSoup
import urllib
import re
import os
url = []
urlbase = "https://quizlet.com/subject/四级乱序/page/"
for i in range(0,2):
url.append(urlbase + str(i+1))
indexname = str(url[i])[-1] + ".html"
urllib.urlretrieve(url[i], indexname)
print indexname + " downloaded"
f = open(indexname,"r")
soup = BeautifulSoup(f, "html.parser")
linkclass = soup.find_all("a", attrs={"class":"SetPreview-link","href":re.compile(r"unit(\s\w+)?")})
for link in link class:
flink = link.get("href")
print flink结果是一些链接，工作得很好。
，但当我用如下代码将它写入文件时：
# encoding = utf-8
from bs4 import BeautifulSoup
import urllib
import re
import os
url = []
urlbase = "https://quizlet.com/subject/四级乱序/page/"
flinkfile = open("links.txt",'wb')
for i in range(0,2):
url.append(urlbase + str(i+1))
indexname = str(url[i])[-1] + ".html"
urllib.urlretrieve(url[i], indexname)
print indexname + " downloaded"
f = open(indexname,"r")
soup = BeautifulSoup(f, "html.parser")
linkclass = soup.find_all("a", attrs={"class":"SetPreview-link", "href":re.compile(r"unit(\s\w+)?")})
for link in linkclass:
flink = link.get("href")
flinkfile.writelines(flink)
flinkfile.close()结果是一个只有一行的txt文件：https://quizlet.com/146113318/unit31-flash-cards/
为什么会这样呢？
回答 1
Stack Overflow用户
回答已采纳
发布于 2016-12-21 06:17:07
问题是文件关闭在for i in range(0,2)循环中。如果您将其移出，您应该得到更多的行(假设有更多的行)：
# encoding = utf-8
from bs4 import BeautifulSoup
import urllib
import re
import os
url = []
urlbase = "https://quizlet.com/subject/四级乱序/page/"
flinkfile = open("links.txt",'wb')
for i in range(0,2):
url.append(urlbase + str(i+1))
indexname = str(url[i])[-1] + ".html"
urllib.urlretrieve(url[i], indexname)
print indexname + " downloaded"
f = open(indexname,"r")
soup = BeautifulSoup(f, "html.parser")
linkclass = soup.find_all("a", attrs={"class":"SetPreview-link", "href":re.compile(r"unit(\s\w+)?")})
for link in linkclass:
flink = link.get("href")
flinkfile.writelines(flink)
# close file outside loop
flinkfile.close()若要确保即使发生错误也关闭文件，请使用with语句：
with open(...) as flinkfile:
for in in range(0,2):
...关于这里的更多信息：http://effbot.org/zone/python-with-statement.htm
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/41256083
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