MRJob - Python的 - 如何返回null时划分为0 /值

Question

我怎么能修改此代码，以便当senti_avg不整除（0 /值），减速机（）输出NULL或NONE，而不是崩溃？

def reducer(self, bs_id, value): 
    avg_data = list(value) 
    senti_sum = sum([a[0] for a in avg_data]) 
    word_sum = sum([a[1] for a in avg_data]) 
    senti_avg = senti_sum/float(word_sum) 

    yield (bs_id, senti_avg) 

Answer 1

您使用python exception handling：

try: 
    senti_avg = senti_sum/float(word_sum) 
except ZeroDivisionError: 
    senti_avg = None