在Python 3中，小数点后2位货币 [英] Decimals to 2 places for money in Python 3

问题描述

如何使用十进制模块使小数位数保持在2位以表示货币？

How do I get my decimals to stay at 2 places for representing money using the decimal module?

我已经设置了精度，并且该死的几乎所有其他东西都遇到了失败。

I've setting the precision, and damn near everything else, and met with failure.

推荐答案

在赚钱时通常需要尽可能地限制精度，以便乘法等操作不会汇总舍入误差。在python 2和3中，您可以 .quantize（）和 Decimal 达到所需的任意精度：

When working with money you usually want to limit precision as late as possible so things like multiplication don't aggregate rounding errors. In python 2 and 3 you can .quantize() a Decimal to any precision you want:

unit_price = decimal.Decimal('8.0107')
quantity = decimal.Decimal('0.056')
price = unit_price * quantity
cents = decimal.Decimal('.01')
money = price.quantize(cents, decimal.ROUND_HALF_UP)

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