python reduce分析
def reduc(functon,iterable,initializer=None):it = iter(iterable)
if initializer is None:
try:
initializer = next(it)
except StopIteration:
raise TypeError('reduce of empty')
accum_value = initializer
for x in iterable:
accum_value = functon(accum_value, x)
return accum_value
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