如何获得最大数量？

Question

好，所以我必须从文件中找到最大数量，并且我有2行数字

line 1- 2,2,3
line 2- 4,3  

现在我想找到最大数量，我的代码也可以正常工作，但问题是它显示了我想找到整个文件最大数量的每一行的最大数量

from mrjob.job import MRJob

class MRNumberCounter(MRJob):
    def mapper(self, key, line):
        for number in line.split():
            yield number, 1                      

    def reducer(self, number, occurrences):
        yield max(number), number

if __name__ == '__main__':
    MRNumberCounter.run()

我希望输出为4

Answer 1

from mrjob.job import MRJob

class MRNumberCounter(MRJob):

    def mapper(self, key, line):
        for number in line.split():
            yield number, 1         

    def combiner(self, number, occurrences):
        yield number, sum(occurrences)

    def reducer(self, number, occurrences):
        yield number, sum(occurrences)


if __name__ == '__main__':
    MRNumberCounter.run()