your_reducer.py

your_reducer.py

def youreducer(func, seq):
    tally = seq[0]
    for next in seq[1:]:
        tally = func(tally, next)
    return tally


def add(x, y):
    return x + y


youreducer((lambda x, y: x + y), [1, 2, 3, 4, 5])
>> 15

youreducer(add, [1, 2, 3, 4, 5])
>> 15

youreducer((lambda x, y: x * y), [1, 2, 3, 4, 5])
>> 120