使用请求下载文件并美化组

Question

我正在尝试使用请求和美化组4从here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()

我得到了AttributeError: 'str' object has no attribute 'read'。

好吧，我知道，但是。。。如何从生成的URL下载？

Answer 1

使用wget可能更容易，因为这样就有了full power of wget（用户代理，请参阅，ignore robots.txt…），如果需要：

import os

names_urls = zip(names, urls)

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

Answer 2

这将把页面中的所有文件及其原始文件名写入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()