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python位运算实战(二)umask应用

上一篇《python位运算(一)概述》我们简单的总结了下位运算的几个种方法和使用技巧。本篇就结合实际应用来看下。适于用什么场景?下面我用 Unix 系统的umask概念来实践下位运算。简单来讲,Unix 系统对于文件的权限用 9 个权限位来控制: 1[-][rwx][r-x][r--] 2 1 234 567 890 r: 可读 4 w: 可写 2 x: 可执行 1 -: 表示此权限……

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python位运算(一)概述

一、位运算概念 位运算是直接对整数在二进制中进行操作。另我们的电脑电路设计都是基于二进制的,所以在二进制层面效率很高。通常位运算多用在对程序效率要求很高的场景。以下的二进制都以8位为例。第1位是符号位,后面7位是数字位。符号位用0代表非负数,用1代表负数。 bitwise 二、2进制编码 1、原码 原……

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