python中可以表示的最小数字是多少? [英] What is the smallest number which can be represented in python?

问题描述

在python中可以表示的最小数字是多少?

What is the smallest number which can be represented in python?

我看过像2.05623357236e-296一样小，但是可以再小的吗?

I have seen as small as 2.05623357236e-296 but can there be any smaller?

推荐答案

签出 sys.float_info

>>> import sys
>>> sys.float_info 
sys.float_info(max=1.7976931348623157e+308, max_exp=1024, max_10_exp=308, min=2.2250738585072014e-308, min_exp=-1021, min_10_exp=-307, dig=15, mant_dig=53, epsilon=2.220446049250313e-16, radix=2, rounds=1)

来自文档

min       DBL_MIN      minimum positive normalized float 
min_exp   DBL_MIN_EXP  minimum integer e such that radix**(e-1) is a normalized float

在我的系统上，它被称为min=2.2250738585072014e-308

On my system it is mentioned as min=2.2250738585072014e-308

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