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Checking Common File Types

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Hello, 
I'm trying to create a script that checks all the files in my 'downloaded' directory against common file types and then tells me how many of the files in that directory aren't either a GIF or a JPG file. I'm familiar with basic Python but this is the first time I've attempted anything like this and I'm looking for a little help or a point in the right direction? 

file_sigs = {'\xFF\xD8\xFF':('JPEG','jpg'),  '\x47\x49\x46':('GIF','gif')}
def readFile():    filename = r'c:/temp/downloads'      fh = open(filename, 'r')     file_sig = fh.read(4) print '[*] check_sig() File:',filename #, 'Hash Sig:', binascii.hexlify(file_sig) 
RegardsJade



 
  		 	   		  

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Checking Common File Types jade <jadec375@msn.com> - 2013-12-01 18:27 +0000

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