def _if_modified_since_passes(last_modified, if_modified_since):
 return ((not last_modified) or (last_modified > if_modified_since))

def _if_modified_since_passes ( last_modified , if_modified_since ) : return ( ( not last_modified ) or ( last_modified > if_modified_since ) )
test the if-modified-since comparison as defined in section 3 .