python-未定义NameError全局名称'buf'

Question

I don't know what this error means. Any advice about the error or the rest of the code is greatly appreciated.

import urllib
import urllib2
import os
import re
from bs4 import BeautifulSoup
def image_scrape():
    url = raw_input("Type url for image scrape: ")
    content = urllib2.urlopen(url).read()
    soup = BeautifulSoup(content)
    name = 0
    for tag in soup.find_all(re.compile("img")):
        path = 'C:\Users\Sorcerer\Downloads'
        name += 1
        filename = name
        file_path = "%s%s" % (path, filename)
        downloaded_image = file(file_path, "wb")
        downloaded_image.write(buf)
        downloaded_image.close()

image_scrape()

Answer 1

You have a line in your code:

downloaded_image.write(buf)

The Python interpreter has not seen this variable buf before in your code. And hence the error.

Thoughts on the rest of your code:

• It is advisable to use the os module to do what you are doing with this line:

   file_path = "%s%s" % (path, filename) 

  like this:

   import os path = os.path.normpath('C:\\\\Users\\\\Sorcerer\\\\Downloads') file_path = os.path.join(path, name) 

• Looks like you are trying to find all the image links in the page and trying to save it to the file system at the location referenced by file_path . Assuming the link to the image is in the variable tag , this is what you do:

   import requests r = requests.get(tag, stream=True) if r.status_code == 200: with open(name, 'wb') as f: for chunk in r.iter_content(): f.write(chunk) f.close()