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"""

>>> avg = make_averager()

>>> avg(10)

10.0

>>> avg(11)

10.5

>>> avg(12)

11.0

>>> avg.__code__.co_varnames

('new_value', 'total')

>>> avg.__code__.co_freevars

('series',)

>>> avg.__closure__ # doctest: +ELLIPSIS

(<cell at 0x...: list object at 0x...>,)

>>> avg.__closure__[0].cell_contents

[10, 11, 12]

"""

DEMO = """

>>> avg.__closure__

(<cell at 0x107a44f78: list object at 0x107a91a48>,)

"""

def make_averager():

series = []

def averager(new_value):

series.append(new_value)

total = sum(series)

return total / len(series)

return averager