if 'raw_input' in dir(__builtins__):

input = raw_input # para funcionar com Python 2

def ler_parcela():

parcela = input('+: ')

try:

parcela = float(parcela)

except ValueError:

return 0

return parcela

# decorator

def coro(func):

def start(*args, **kwargs):

g = func(*args, **kwargs)

next(g)

return g

return start

@coro

def somadora():

qt_parcelas = 0

total = 0

try:

while True:

parcela = yield

qt_parcelas += 1

total += parcela

print('parcelas: %d total: %d' % (qt_parcelas, total))

finally:

print('parcelas: %d total: %d media: %d' % (qt_parcelas, total, total/qt_parcelas))

def main():

coro = somadora()

while True:

parcela = ler_parcela()

if parcela:

coro.send(parcela)

else:

print('Fechando corotina...')

coro.close()

break

if __name__=='__main__':

main()