def pos_tag(tokens, tagset=None, lang='eng'):
 tagger = _get_tagger(lang)
 return _pos_tag(tokens, tagset, tagger)

def pos_tag ( tokens , tagset = None , lang = 'eng' ) : tagger = _get_tagger ( lang ) return _pos_tag ( tokens , tagset , tagger )
use nltks currently recommended part of speech tagger to tag the given list of tokens .