阅读Python中至少显著位 [英] Reading least significant bits in Python

问题描述

我不必解析Python中的syslog信息的工具和严重性。这些值来每条消息作为一个整数。该事件的严重性是0-7，在整数3至少显著位指定。什么是从数量评估这3位最简单的/最快的方式？

在code我现在只是做了3位右移，比乘这个数字8次，并从原来的中减去的结果。

  FAC =（INT（PRI）GT;＆GT; 3）
SEV = PRI  - （FAC * 8​​）
 

有必须要做这个 - 而不是歼灭位，减去一个令人费解的较小的方式。

（我的职业是系统管理员的话，我不知道有多少的basics-的请与我裸露！）

解决方案

  SEV = PRI和放大器; 7
FAC = PRI＆GT;＆GT; 3
 

这样的。

I am having to parse the Facility and Severity of syslog messages in Python. These values come with each message as a single integer. The severity of the event is 0-7, specified in the 3 least significant bits in the integer. What is the easiest/fastest way to evaluate these 3 bits from the number?

The code I have right now just does a 3 bit right shift, than multiplies that number times 8, and subtracts the result from the original.

FAC = (int(PRI) >> 3)
SEV = PRI - (FAC * 8)

There must be a less convoluted way to do this- rather than wiping out the bits, and substracting.

(I am a sys admin by trade so, I don't know many of the basics- please bare with me!)

解决方案

SEV = PRI & 7
FAC = PRI >> 3

Like that.

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