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  • map reduce

    import schedule
    import time
    from functools import reduce
    
    
    def get_():
        print("working ...")
    
    
    def main():
        schedule.every(2).seconds.do(get_)
    
        while True:
            schedule.run_pending()
            time.sleep(0.2)
    
    
    def xxx():
        import itertools
        scientists = ({'name': 'Alan Turing', 'age': 105, 'gender': 'male'},
                      {'name': 'Dennis Ritchie', 'age': 76, 'gender': 'male'},
                      {'name': 'Ada Lovelace', 'age': 202, 'gender': 'female'},
                      {'name': 'Frances E. Allen', 'age': 84, 'gender': 'female'})
        # grouped = {item[0]: list(item[1])
        #            for item in itertools.groupby(scientists, lambda x: x['gender'])}
        # print(grouped)
        for i in itertools.groupby(scientists, lambda x: x['gender']):
            print(i[0], list(i[1]))
            # print(i)
    
    
    def less_data(x, y):
        return x-y
    
    
    def test_reduce():
        res = reduce(less_data, [10, 32, 6, 1])
        print(res)
        return
    
    
    def test_map():
        res = map(less_data, [10, 32, 6, 1], [1, 2, 3, 4])
        print(list(res))
        # for x in res:
        #     print(x)
        # print(res)
    
    
    def add(data_list):
        if data_list[0] - data_list[1] > 5:
            return True
        else:
            return False
    
    
    def test_filter():
        """
        filter(function_or_None, iterable)
        function 只能返回True or False
        :return:
        """
        res = filter(add, [[10,1],[2,10]])
        print(list(res))
    
    
    if __name__ == "__main__":
        pass
        # main()
        # test_reduce()
        # test_map()
        test_filter()
    
    
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  • 原文地址:https://www.cnblogs.com/lajiao/p/10579434.html
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