MRJob - Python - How to return null when division is 0/value

Question

How can I modify this code so when senti_avg is not divisible (0/value), reducer() outputs NULL or NONE instead of crashing?

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

You use python exception handling :

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