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from collections import namedtuple


    

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Result = namedtuple('Result', 'count average')


    

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## the Subgenerator
def averager():
    total = 0.0
    count = 0
    average = None
    
    while True:
        term = yield
        if term is None:
            break
        total += term
        count += 1
        average = total/count
    return Result(count, average)

## Delegating Generator
def grouper(results, key):
    while True:
        results[key] = yield from averager()
        #print("next averager")
        
        
# The Client code, a.k.a the Caller
def main(data):
    results = {}
    for key, values in data.items():
        group = grouper(results, key)
        next(group)
        for value in values:
            group.send(value)
        group.send(None)
    
    report(results)


    

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def report(results):
    for key, result in sorted(results.items()):
        group, unit = key.split(';')
        print('{:2} {:5} averaging {:.2f}{}'.format(
              result.count, group, result.average, unit))


    

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data = {
    'girls;kg':
        [40.9, 38.5, 44.3, 42.2, 45.2, 41.7, 44.5, 38.0, 40.6, 44.5],
    'girls;m':
        [1.6, 1.51, 1.4, 1.3, 1.41, 1.39, 1.33, 1.46, 1.45, 1.43],
    'boys;kg':
        [39.0, 40.8, 43.2, 40.8, 43.1, 38.6, 41.4, 40.6, 36.3],
    'boys;m':
        [1.38, 1.5, 1.32, 1.25, 1.37, 1.48, 1.25, 1.49, 1.46],
}


    

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main(data)


    

    




 9 boys  averaging 40.42kg
 9 boys  averaging 1.39m
10 girls averaging 42.04kg
10 girls averaging 1.43m

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