使用请求和BeautifulSoup下载文件

Question

我正在尝试使用requests和beautifulsoup4从这里下载一堆pdf文件.这是我的代码:

import requests
from bs4 import BeautifulSoup as bs

_ANO = '2013/'
_MES = '01/'
_MATERIAS = 'matematica/'
_CONTEXT = 'wp-content/uploads/' + _ANO + _MES
_URL = 'http://www.desconversa.com.br/' + _MATERIAS + _CONTEXT

r = requests.get(_URL)
soup = bs(r.text)

for i, link in enumerate(soup.findAll('a')):
    _FULLURL = _URL + link.get('href')

    for x in range(i):
        output = open('file[%d].pdf' % x, 'wb')
        output.write(_FULLURL.read())
        output.close()

我到了AttributeError: 'str' object has no attribute 'read'.

好的,我知道,但是...如何从生成的URL下载？

Answer 1

这会将页面中包含原始文件名的所有文件写入pdfs/目录.

import requests
from bs4 import BeautifulSoup as bs
import urllib2


_ANO = '2013/'
_MES = '01/'
_MATERIAS = 'matematica/'
_CONTEXT = 'wp-content/uploads/' + _ANO + _MES
_URL = 'http://www.desconversa.com.br/' + _MATERIAS + _CONTEXT

# functional
r = requests.get(_URL)
soup = bs(r.text)
urls = []
names = []
for i, link in enumerate(soup.findAll('a')):
    _FULLURL = _URL + link.get('href')
    if _FULLURL.endswith('.pdf'):
        urls.append(_FULLURL)
        names.append(soup.select('a')[i].attrs['href'])

names_urls = zip(names, urls)

for name, url in names_urls:
    print url
    rq = urllib2.Request(url)
    res = urllib2.urlopen(rq)
    pdf = open("pdfs/" + name, 'wb')
    pdf.write(res.read())
    pdf.close()

Answer 2

使用可能会更容易wget，因为如果需要，您将拥有wget的全部功能（用户代理，请关注，忽略robots.txt ...）：

import os

names_urls = zip(names, urls)

for name, url in names_urls:
    print('Downloading %s' % url)
    os.system('wget %s' % url)