changed variable name `on` to `output_file_name`

compress/versioning/mtime/__init__.py

@@ -3,7 +3,6 @@ import os
 from compress.utils import get_output_filename, media_root
 from compress.versioning.base import VersioningBase
 
-
 def max_mtime(files):
     return int(max([os.stat(media_root(f)).st_mtime for f in files]))
 
@@ -18,8 +17,8 @@ class MTimeVersioning(VersioningBase):
         
     def needs_update(self, output_file, source_files, version):
 
-        on = get_output_filename(output_file, version)
-        compressed_file_full = media_root(on)
+        output_file_name = get_output_filename(output_file, version)
+        compressed_file_full = media_root(output_file_name)
 
         return (os.stat(compressed_file_full).st_mtime < version), version