6

我正在为推送服务制作图像采集器;但是,每当我生成一个随机 URL 并尝试将其验证为 .PNG 图像时,就会生成一个错误。我今天早些时候刚开始学习 Python 语言,所以你可以说我对此很陌生!

产生的错误:

Traceback (most recent call last):
  File "run.py", line 19, in <module>
    extension = guess_extension(guess_type(url))
  File "C:\Python33\lib\mimetypes.py", line 320, in guess_extension
    return _db.guess_extension(type, strict)
  File "C:\Python33\lib\mimetypes.py", line 189, in guess_extension
    extensions = self.guess_all_extensions(type, strict)
  File "C:\Python33\lib\mimetypes.py", line 168, in guess_all_extensions
    type = type.lower()
AttributeError: 'tuple' object has no attribute 'lower'

运行的代码:

#!/usr/bin/env python
import sys
import urllib
from mimetypes import guess_type, guess_extension
from random import choice

randoms = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
           'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I',' J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
           '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'];

downloads = 1;

#the number of files we want to download
target = int(sys.argv[1]);

while downloads <= target:
    string = choice(randoms)+choice(randoms)+choice(randoms)+choice(randoms)+choice(randoms)
    url = 'http://puu.sh/'+string

    print(str(downloads)+': '+string)

    #download
    extension = guess_extension(guess_type(url))
    print(extension)

    #urllib.request('http://puu.sh/'+string, string+'.png')
    downloads += 1

关于这个错误试图告诉我什么的任何想法?谢谢。

4

2 回答 2

7

guess_type()返回一个元组(type,encoding),而guess_extension()接受一个参数type

线

extension = guess_extension(guess_type(url))

调用guess_type然后将其返回值(元组)传递给guess_extension. 您应该只传递元组的第一个元素 ( type)

extension = guess_extension(guess_type(url)[0])
于 2013-07-22T06:49:15.973 回答
0

我可以建议将来,当您遇到这样的问题时,print任何让您悲伤的变数。

因此,在您现在的情况下,如果您这样做,print (type)python 会给您元组,您将能够查看您要查找的 URL 是否在其中,然后完成type = type[0].lower()

于 2013-07-22T06:59:33.173 回答