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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def decimal_round(number, num_digits, rounding=ROUND_HALF_UP):
 """ Rounding for decimals with support for negative digits """

    exp = Decimal(10) ** -num_digits

    if num_digits >= 0:
        return number.quantize(exp, rounding)
    else:
        return exp * (number / exp).to_integral_value(rounding)