How to use 'python math round' in Python

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631def rpy_round(number, ndigits):
632 # Algorithm copied directly from CPython
633
634 if number == 0 or rfloat.isinf(number) or rfloat.isnan(number):
635 return number
636
637 # Deal with extreme values for ndigits. For ndigits > NDIGITS_MAX, x
638 # always rounds to itself. For ndigits < NDIGITS_MIN, x always
639 # rounds to +-0.0.
640 if ndigits > NDIGITS_MAX:
641 return number
642 elif ndigits < NDIGITS_MIN:
643 # return 0.0, but with sign of x
644 return 0.0 * number
645
646 # finite x, and ndigits is not unreasonably large
647 z = rfloat.round_double(number, ndigits)
648 if rfloat.isinf(z):
649 raise OverflowError
650 return z
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