如何在Python中表示一个无限数? [英] How can I represent an infinite number in Python?

问题描述

如何在python中表示一个无限数?无论您在程序中输入哪个数字，都不能大于此无穷大表示形式.

How can I represent an infinite number in python? No matter which number you enter in the program, no number should be greater than this representation of infinity.

推荐答案

在Python中，您可以执行以下操作:

In Python, you can do:

test = float("inf")

在Python 3.5中，您可以执行以下操作:

In Python 3.5, you can do:

import math
test = math.inf

然后:

test > 1
test > 10000
test > x

将永远是真实的.当然，除非指出，否则x也是无穷大或"nan"(不是数字").

Will always be true. Unless of course, as pointed out, x is also infinity or "nan" ("not a number").

另外(仅Python 2.x)，与Ellipsis相比，float(inf)较小，例如:

Additionally (Python 2.x ONLY), in a comparison to Ellipsis, float(inf) is lesser, e.g:

float('inf') < Ellipsis

将返回true.

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