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class Accumulator:
def __init__(self, len):
self.sum = 0
self.index = 1
self.len = len
def __iter__(self):
return self
def __next__(self):
if self.len > 0:
self.len -= 1
self.sum += self.index
self.index += 1
return self.sum
else:
raise StopIteration #抛出StopIteration异常
accu = Accumulator(10)
Accuiter = iter(accu)
while True:
try:
print(next(Accuiter), end=' ')
except StopIteration:
pass