通过Python可以达到的最高时间精度范围是多少? [英] What is the highest scale of time precision that can be reached via Python?

问题描述

考虑一个非常简单的计时器；

start = time.time()
end = time.time() - start 
while(end<5):
    end = time.time() - start
    print end

此计时器的精度如何?我的意思是，与实时时钟相比，该时钟的同步性和实时性如何?

现在是真正的问题；

使用Python可以精确测量的最小时间量是多少?

解决方案

这完全取决于平台.使用 timeit.default_timer()函数，它将返回最适用于您平台的精确计时器 .

从文档中:

以特定于平台的方式定义默认计时器.在Windows上，time.clock()具有微秒级的粒度，但是time.time()的粒度为1/60秒.在Unix上，time.clock()具有1/100秒的粒度，而time.time()更精确.

因此，在Windows上，您获得的是微秒，在Unix上，您将获得平台可以提供的任何精度，通常 (远远超过)1/100秒.

Consider a very simple timer;

start = time.time()
end = time.time() - start 
while(end<5):
    end = time.time() - start
    print end

how precise is this timer ? I mean compared to real-time clock, how synchronized and real-time is this one ?

Now for the real question ;

What is the smallest scale of time that can be measured precisely with Python ?

解决方案

This is entirely platform dependent. Use the timeit.default_timer() function, it'll return the most precise timer for your platform.

From the documentation:

Define a default timer, in a platform-specific manner. On Windows, time.clock() has microsecond granularity, but time.time()‘s granularity is 1/60th of a second. On Unix, time.clock() has 1/100th of a second granularity, and time.time() is much more precise.

So, on Windows, you get microseconds, on Unix, you'll get whatever precision the platform can provide, which is usually (much) better than 1/100th of a second.

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