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import collections
import operator
# py3 doesn't include reduce as a builtin
try:
reduce
except NameError:
from functools import reduce
def product(sequence, initial=1):
"""like the built-in sum, but for multiplication."""
if not isinstance(sequence, collections.Iterable):
raise TypeError("'{}' object is not iterable".format(type(sequence).__name__))
return reduce(operator.mul, sequence, initial)
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