class Result:
    def __init__(self):
        self.data = []
    def add(self, key, value):
        self.data.append((key,value))

def result_iterator(result):
    return result.data

class MapReduceJob:
    def __init__(self, inputfilename, funmap, funreduce):
        self.inputfilename = inputfilename
        self.fun_map = funmap
        self.fun_reduce = funreduce
        
    def execute(self):
        intermediate_res = []
        f = open(self.inputfilename)
        for e in f:
            intermediate_res += self.fun_map(e,None)

        res = Result()
        self.fun_reduce(intermediate_res, res, None)
        return res