44 lines
888 B
Python
44 lines
888 B
Python
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"""
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A coroutine to compute a running average
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# tag::CORO_AVERAGER_TEST[]
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>>> coro_avg = averager() # <1>
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>>> next(coro_avg) # <2>
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0.0
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>>> coro_avg.send(10) # <3>
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10.0
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>>> coro_avg.send(30)
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20.0
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>>> coro_avg.send(5)
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15.0
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# end::CORO_AVERAGER_TEST[]
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# tag::CORO_AVERAGER_TEST_CONT[]
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>>> coro_avg.send(20) # <1>
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16.25
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>>> coro_avg.close() # <2>
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>>> coro_avg.close() # <3>
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>>> coro_avg.send(5) # <4>
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Traceback (most recent call last):
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...
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StopIteration
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# end::CORO_AVERAGER_TEST_CONT[]
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"""
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# tag::CORO_AVERAGER[]
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from collections.abc import Generator
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def averager() -> Generator[float, float, None]: # <1>
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total = 0.0
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count = 0
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average = 0.0
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while True: # <2>
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term = yield average # <3>
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total += term
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count += 1
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average = total/count
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# end::CORO_AVERAGER[]
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