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从Python代码管中窥豹:资本的渗透无孔不入,效率也要为资本服务、为资本让路!

  • 2026-04-18 02:37:10
从Python代码管中窥豹:资本的渗透无孔不入,效率也要为资本服务、为资本让路!

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先来看看VBA中RoundApplication.Round的区别,明确VBA两者的舍入规则差异

函数

所属环境

舍入规则

示例(保留0位小数)

关键特点

Round(数值, 位数)

VBA原生函数

银行家舍入(四舍六入五成双)

Round(2.5,0)=2Round(3.5,0)=4

当小数部分为0.5时,向最近的偶数取整

Application.Round(数值, 位数)

Excel对象模型

传统四舍五入(五进一)

Application.Round(2.5,0)=3Application.Round(3.5,0)=4

无论奇偶,0.5均向绝对值增大方向取整

补充说明

  • 银行家舍入(Banker's Rounding)是一种统计上更公平的舍入方式,减少累计误差;

  • 传统四舍五入(Arithmetic Rounding)是日常最常用的舍入方式,但易导致正向偏差。

Python中的对应实现方案

Python通过不同函数/模块区分两种舍入规则,以下是具体映射:

(一)类似VBA Round:银行家舍入 → Python内置round()函数

Python的round(number, ndigits)原生内置函数,采用银行家舍入(与VBA Round完全一致)。

规则与示例

  1. 先对number乘以10^ndigits(放大到目标精度),再按银行家舍入取整,按“四舍六入五成双”取整(0.5向最近偶数靠拢);最后除以10^ndigits

  2. 当小数部分恰好为0.5时,向最近的偶数取整。

# 保留0位小数(整数)print(round(2.5))   # 输出22.5→最近偶数2print(round(3.5))   # 输出43.5→最近偶数4print(round(-2.5))  # 输出-2(-2.5→最近偶数-2# 保留1位小数print(round(1.2351))  # 输出1.2(第2位小数3<5,舍去)print(round(1.251))   # 输出1.2(第2位小数5→向偶数1.2靠拢)

(二)类似VBA Application.Round:传统四舍五入 → Python decimal模块

VBA的Application.Round传统四舍五入(五进一),Python中需用decimal模块(高精度十进制运算)实现,通过设置舍入模式ROUND_HALF_UP(半向上舍入)。

步骤与示例

  1. 导入Decimal类(处理高精度数值)和ROUND_HALF_UP常量(指定舍入模式);

  2. 将输入转为Decimal对象(避免浮点精度误差);

  3. quantize()方法指定精度和舍入规则。

from decimal import Decimal, ROUND_HALF_UPdef vba_app_round(number, decimals=0):    # 用字符串初始化Decimal(避免浮点误差)    num = Decimal(str(number))    # 构造精度(如decimals=1→'0.0')    precision = Decimal('0.' + '0'*(decimals-1) + '1') if decimals > 0 else Decimal('1')    # 按ROUND_HALF_UP舍入    return num.quantize(precision, rounding=ROUND_HALF_UP)# 测试示例(保留0位小数)print(vba_app_round(2.5))   # 输出3(五进一)print(vba_app_round(-2.5))  # 输出-3(绝对值增大)print(vba_app_round(1.251)) # 输出1.3(第2位小数5→进一)

(三)替代方案:自定义四舍五入函数(简化版)

若不想用decimal模块,可通过数学运算模拟传统四舍五入(适用于简单场景):

import mathdef round_half_up(n, decimals=0):    multiplier = 10 ** decimals    # 正数:加0.5后取整;负数:减0.5后取整(或用绝对值处理)    if n >= 0:        return math.floor(n * multiplier + 0.5) / multiplier    else:        return math.ceil(n * multiplier - 0.5) / multiplier# 测试print(round_half_up(2.5))    # 3.0print(round_half_up(3.5))    # 4.0print(round_half_up(-2.5))   # -3.0print(round_half_up(1.2351)) # 1.2

四、VBA与Python舍入方案全面对比

维度

VBA Round

VBA Application.Round

Python对应方案

舍入规则

银行家舍入(五成双)

传统四舍五入(五进一)

内置round()(银行家舍入);decimal.ROUND_HALF_UP(四舍五入)

所属环境

VBA原生

Excel对象模型

Python标准库(round());decimal模块

示例(2.5→0位)

2

3

round(2.5)=2vba_app_round(2.5)=3

优势

统计公平,减少累计误差

符合日常直觉

round()高效;decimal高精度

五、视野拓展:Python decimal模块的舍入模式

decimal模块支持8种IEEE 754标准舍入模式,除ROUND_HALF_UP外,常用模式包括:

  • ROUND_HALF_EVEN:银行家舍入(Python round()默认);

  • ROUND_DOWN:截断(向零取整,如2.9→2);

  • ROUND_UP:向上取整(远离零,如2.1→3);

  • ROUND_CEILING:向正无穷取整(如-2.1→-2)。

六、总结

  • VBA的Round≈ Python内置round()(银行家舍入);

  • VBA的Application.Round≈ Pythondecimal.ROUND_HALF_UP(传统四舍五入);

  • 财务/高精度计算优先用decimal模块,日常简单场景用round()或自定义函数。

资本的渗透力度,从这个银行家算法设计中可见一斑!

所谓千里之行始于足下: 不积跬步,无以至千里。不积小流,无以成江海。骐骥一跃,不能十步。驽马十驾,功在不舍。锲而舍之,朽木不折。锲而不舍,金石可镂。每天进步一点点,总会离成功更近一点吧!

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  1. CONNECT:[ UseTime:0.000441s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000643s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000270s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000296s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000528s ]
  6. SELECT * FROM `set` [ RunTime:0.004869s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001396s ]
  8. SELECT * FROM `article` WHERE `id` = 484905 LIMIT 1 [ RunTime:0.008684s ]
  9. UPDATE `article` SET `lasttime` = 1776642296 WHERE `id` = 484905 [ RunTime:0.010349s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000690s ]
  11. SELECT * FROM `article` WHERE `id` < 484905 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005949s ]
  12. SELECT * FROM `article` WHERE `id` > 484905 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003820s ]
  13. SELECT * FROM `article` WHERE `id` < 484905 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009696s ]
  14. SELECT * FROM `article` WHERE `id` < 484905 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007337s ]
  15. SELECT * FROM `article` WHERE `id` < 484905 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.011473s ]
0.154354s