# -*- coding: utf-8 -*-
# !/usr/bin/env python

from decimal import Decimal, ROUND_HALF_UP


def force_decimal(amount):
    """Given an amount of unknown type, type cast it to be a Decimal."""
    if not isinstance(amount, Decimal):
        return Decimal(str(amount))
    return amount


def quantize(decimal_value, places = '0.01'):
    # type:(Decimal, str)->Decimal
    return decimal_value.quantize(Decimal(places), rounding = ROUND_HALF_UP)


class UnitBase(object):

    @classmethod
    def initial(cls, default = '0'):
        return cls(default)