def last_modified(self):
        """ Get the date of last file modification """
        if self.get('Last-Modified'):
            return arrow.get(self.get('Last-Modified'))
        return self.date
def last_modified ( self ) : if self . get ( 'Last-Modified' ) : return arrow . get ( self . get ( 'Last-Modified' ) ) return self . date
Get the date of last file modification