def _GetNumNonVisibleFiles(file_list):
 return len([f for f in file_list if (not BufferIsVisible(GetBufferNumberForFilename(f, False)))])

def _GetNumNonVisibleFiles ( file_list ) : return len ( [ f for f in file_list if ( not BufferIsVisible ( GetBufferNumberForFilename ( f , False ) ) ) ] )
returns the number of file in the iterable list of files |file_list| which are not curerntly open in visible windows .