46 lines
977 B
Python
46 lines
977 B
Python
"""
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Closing a generator raises ``GeneratorExit`` at the pending ``yield``
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>>> coro_avg = averager()
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>>> next(coro_avg)
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0.0
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>>> coro_avg.send(10)
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10.0
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>>> coro_avg.send(20)
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15.0
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>>> coro_avg.send(30)
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20.0
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>>> coro_avg.close()
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-> total: 60.0 average: 20.0 terms: 3
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Other exceptions propagate to the caller:
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>>> coro_avg = averager()
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>>> next(coro_avg)
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0.0
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>>> coro_avg.send(10)
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10.0
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>>> coro_avg.send('spam')
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Traceback (most recent call last):
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...
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TypeError: unsupported operand type(s) for +=: 'float' and 'str'
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"""
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# BEGIN CORO_AVERAGER
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def averager():
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total = average = 0.0
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count = 0
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try:
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while True:
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term = yield average
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total += term
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count += 1
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average = total/count
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except GeneratorExit:
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msg = '-> total: {} average: {} terms: {}'
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print(msg.format(total, average, count))
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# END CORO_AVERAGER
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