import nltk
grammar = nltk.CFG.fromstring(open("atis/atis-grammar-cnf.cfg").read())
sentences = open("atis/atis-test-sentences.txt").read()
testSentences = nltk.parse.util.extract_test_sentences(sentences,encoding="latin2")

# initialize the parser
parser = nltk.parse.BottomUpChartParser(grammar)
# parse all test sentences
for sentence in testSentences:
    parser.chart_parse(sentence[0])