app.py

classifier=pickle.load(open('classifier.pkl','rb'))

def extract_features(word_list):
    return dict([(word, True) for word in word_list])

def predictSentiment(text):
    print('predict Sentiement',text)
    probdist = classifier.prob_classify(extract_features(text.split()))
    pred_sentiment = probdist.max()
    print("Predicted sentiment: ", pred_sentiment)
    return pred_sentiment