1 files changed, 19 insertions, 20 deletions

diff --git a/libmat/exiftool.py b/libmat/exiftool.py
index aa6849d..0e1fefd 100644
--- a/libmat/exiftool.py
+++ b/libmat/exiftool.py
@@ -1,5 +1,5 @@
-''' Care about images with help of the amazing (perl) library Exiftool.
-'''
+""" Care about images with help of the amazing (perl) library Exiftool.
+"""
 
 import subprocess
 
@@ -7,25 +7,24 @@ import parser
 
 
 class ExiftoolStripper(parser.GenericParser):
-    ''' A generic stripper class using exiftool as backend
-    '''
+    """ A generic stripper class using exiftool as backend
+    """
 
     def __init__(self, filename, parser, mime, backup, is_writable, **kwargs):
         super(ExiftoolStripper, self).__init__(filename, parser, mime, backup, is_writable, **kwargs)
-        self.allowed = set(['ExifTool Version Number', 'File Name', 'Directory',
-                'File Size', 'File Modification Date/Time', 'File Access Date/Time', 'File Permissions',
-                'File Type', 'File Type Extension', 'MIME Type', 'Image Width', 'Image Height',
-                'Image Size', 'File Inode Change Date/Time', 'Megapixels'])
+        self.allowed = {'ExifTool Version Number', 'File Name', 'Directory', 'File Size', 'File Modification Date/Time',
+                        'File Access Date/Time', 'File Permissions', 'File Type', 'File Type Extension', 'MIME Type',
+                        'Image Width', 'Image Height', 'Image Size', 'File Inode Change Date/Time', 'Megapixels'}
         self._set_allowed()
 
     def _set_allowed(self):
-        ''' Virtual method. Set the allowed/harmless list of metadata
-        '''
+        """ Virtual method. Set the allowed/harmless list of metadata
+        """
         raise NotImplementedError
 
     def remove_all(self):
-        ''' Remove all metadata with help of exiftool
-        '''
+        """ Remove all metadata with help of exiftool
+        """
         try:
             if self.backup:
                 self.create_backup_copy()
@@ -38,16 +37,16 @@ class ExiftoolStripper(parser.GenericParser):
             return False
 
     def is_clean(self):
-        ''' Check if the file is clean with the help of exiftool
-        '''
+        """ Check if the file is clean with the help of exiftool
+        """
         return not self.get_meta()
 
     def get_meta(self):
-        ''' Return every harmful meta with help of exiftool.
+        """ Return every harmful meta with help of exiftool.
             Exiftool output looks like this:
             field name : value
             field name : value
-        '''
+        """
         output = subprocess.Popen(['exiftool', self.filename],
                 stdout=subprocess.PIPE).communicate()[0]
         meta = {}
@@ -59,9 +58,9 @@ class ExiftoolStripper(parser.GenericParser):
 
 
 class JpegStripper(ExiftoolStripper):
-    ''' Care about jpeg files with help
+    """ Care about jpeg files with help
         of exiftool
-    '''
+    """
     def _set_allowed(self):
         self.allowed.update(['JFIF Version', 'Resolution Unit',
         'X Resolution', 'Y Resolution', 'Encoding Process',
@@ -69,9 +68,9 @@ class JpegStripper(ExiftoolStripper):
 
 
 class PngStripper(ExiftoolStripper):
-    ''' Care about png files with help
+    """ Care about png files with help
         of exiftool
-    '''
+    """
     def _set_allowed(self):
         self.allowed.update(['Bit Depth', 'Color Type',
             'Compression', 'Filter', 'Interlace', 'Palette',