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Python保留float类型小数点后3位
阅读量:343 次
发布时间:2019-03-04

本文共 453 字,大约阅读时间需要 1 分钟。

  • float

    查询持仓数据,数字货币交易所一般给出的是float类型,且小数点十几位,为了展示便捷,只保留小数点后3位。

    float数据类型,保留小数点的方式有三种

  • 一、round()

    >> x = 3.897654326>> round(x, 3)3.898>> x = 3.000000>> round(x, 3)3.0

    round函数自动四舍五入;自动去掉多余的0

  • 二、'%.3f'%x

    >> x = 3.897654326>> '%.3f' % x3.898>> x = 3.000000>> '%.3f' % x3.000

    '%.3f'%x自动四舍五入;保留多余的0

  • 三、decimal

    >> from decimal import Decimal>> Decimal('3.897654326').quantize(Decimal('0.000'))3.898>> Decimal('3.000000000').quantize(Decimal('0.000'))3.000
  • References

转载地址:http://wlre.baihongyu.com/

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