python - MRJob - Python - 当除法为 0/值时如何返回 null

Question

如何修改此代码，以便当 senti_avg 不可整除（0/值）时，reducer() 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 异常处理：

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