mime types - Python, trying to get file extension via URL -

i'm making image grabber puush service; however, whenever generate random url , attempt verify .png image, error generated. took python language earlier today, i'm new this!

the error generated:

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' 

the code ran:

#!/usr/bin/env python import sys import urllib mimetypes import guess_type, guess_extension 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 want 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 

any ideas on error attempting tell me? thanks.

guess_type() returns tuple (type,encoding), whereas guess_extension() accepts single argument type.

the line

extension = guess_extension(guess_type(url)) 

calls guess_type , passes return value (tuple) guess_extension. should pass first element of tuple (type)

extension = guess_extension(guess_type(url)[0])