用Python爬虫批量爬取并下载贴吧图片遇到的问题记录

想着今晚就从简单开始吧，万万没想到，还是问题百出。真是伤筋。

import requests

from lxml import etree

headers = {'User-Agent':'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36 SE 2.X MetaSr 1.0'}

def getImg(url):

html = requests.get(url,headers=headers)

response = etree.HTML(html.text)

#imglink = response.xpath('//*[@id="post_content_81126411541"]/div[2]/div/img[1]/@src')

imglinks = response.xpath('//img[@class="BDE_Image"]/@src')

for eachimglink in imglinks:

E = str(eachimglink)

with open('./img/%s.jpg'%E[-20:-4],'wb') as f:

f.write(eachimglink)

if __name__ == '__main__':

url = 'http://tieba.baidu.com/p/4229456347?pn=2'

getImg(url)

运行结果：TypeError: a bytes-like object is required, not 'lxml.etree._ElementUnicodeResult'

类型错误。

TypeError: a bytes-like object is required, not 'lxml.etree._ElementUnicodeResult'

以作记录吧。大概也估摸着是传入的参数错误，但是就是不知道错在哪里。

Traceback (most recent call last):

File "E:\py\pyqt5\tieba.py", line 17, in

getImg(url)

File "E:\py\pyqt5\tieba.py", line 13, in getImg

f.write(eachimglink)

TypeError: a bytes-like object is required, not 'lxml.etree._ElementUnicodeResult'

[Finished in 1.0s with exit code 1]

[shell_cmd: python -u "E:\py\pyqt5\tieba.py"]

[dir: E:\py\pyqt5]

[path: C:\Program Files (x86)\Common Files\Intel\Shared Libraries\redist\intel64_win\compiler;C:\Program Files (x86)\Common Files\Intel\Shared Files\cpp\bin\Intel64;C:\Program Files (x86)\Common Files\Intel\Shared Libraries\redist\intel64\compiler;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;c:\Program Files (x86)\QuickTime\QTSystem\;C:\Program Files (x86)\Windows Kits\8.1\Windows Performance Toolkit\;C:\Users\Administrator\AppData\Local\Programs\Python\Python36\Scripts\;C:\Users\Administrator\AppData\Local\Programs\Python\Python36\;E:\py\phantomjs-2.1.1-windows\phantomjs-2.1.1-windows\bin\]