-            output += 'Style: ' + style.attrib["name"]
-            output += ',' + style.attrib["font_name"]
-            output += ',' + style.attrib["font_size"]
-            output += ',' + style.attrib["primary_colour"]
-            output += ',' + style.attrib["secondary_colour"]
-            output += ',' + style.attrib["outline_colour"]
-            output += ',' + style.attrib["back_colour"]
-            output += ',' + ass_bool(style.attrib["bold"])
-            output += ',' + ass_bool(style.attrib["italic"])
-            output += ',' + ass_bool(style.attrib["underline"])
-            output += ',' + ass_bool(style.attrib["strikeout"])
-            output += ',' + style.attrib["scale_x"]
-            output += ',' + style.attrib["scale_y"]
-            output += ',' + style.attrib["spacing"]
-            output += ',' + style.attrib["angle"]
-            output += ',' + style.attrib["border_style"]
-            output += ',' + style.attrib["outline"]
-            output += ',' + style.attrib["shadow"]
-            output += ',' + style.attrib["alignment"]
-            output += ',' + style.attrib["margin_l"]
-            output += ',' + style.attrib["margin_r"]
-            output += ',' + style.attrib["margin_v"]
-            output += ',' + style.attrib["encoding"]
+            output += 'Style: ' + style.attrib['name']
+            output += ',' + style.attrib['font_name']
+            output += ',' + style.attrib['font_size']
+            output += ',' + style.attrib['primary_colour']
+            output += ',' + style.attrib['secondary_colour']
+            output += ',' + style.attrib['outline_colour']
+            output += ',' + style.attrib['back_colour']
+            output += ',' + ass_bool(style.attrib['bold'])
+            output += ',' + ass_bool(style.attrib['italic'])
+            output += ',' + ass_bool(style.attrib['underline'])
+            output += ',' + ass_bool(style.attrib['strikeout'])
+            output += ',' + style.attrib['scale_x']
+            output += ',' + style.attrib['scale_y']
+            output += ',' + style.attrib['spacing']
+            output += ',' + style.attrib['angle']
+            output += ',' + style.attrib['border_style']
+            output += ',' + style.attrib['outline']
+            output += ',' + style.attrib['shadow']
+            output += ',' + style.attrib['alignment']
+            output += ',' + style.attrib['margin_l']
+            output += ',' + style.attrib['margin_r']
+            output += ',' + style.attrib['margin_v']
+            output += ',' + style.attrib['encoding']