BLEU Score calculation

bleu.py

#!/usr/bin/env python

from nltk.translate.bleu_score import sentence_bleu

def perfect():
    machine_translation = "this blog talks about scoring machine translated text" 
    machine_trans = machine_translation.split()
    reference_translation = "this blog talks about scoring machine translated text"
    reference_trans = [reference_translation.split()]
    score = sentence_bleu(reference_trans,machine_trans)
    return score

def imperfect():
    machine_translation = "the quick brown fox" 
    machine_trans = machine_translation.split()
    reference_translation = "this blog talks about scoring machine translated text"
    reference_trans = [reference_translation.split()]
    score = sentence_bleu(reference_trans,machine_trans)
    return score
    
if __name__ == '__main__':
    print perfect()
    print imperfect()