问题描述
为什么在Python中0 ** 0等于1?它不应该像0 / 0一样引发异常吗?
Why does 0 ** 0 equal 1 in Python? Shouldn't it throw an exception, like 0 / 0 does?
推荐答案
Wikipedia对历史记录进行了有趣的报道.以及关于0 ** 0值的的不同观点:
Wikipedia has interesting coverage of the history and the differing points of view on the value of 0 ** 0:
应用于计算机的 IEEE 754 建议了几种用于计算功率的函数.它将pow(0, 0)和pown(0, 0)定义为返回1，将powr(0, 0)定义为返回NaN.
As applied to computers, IEEE 754 recommends several functions for computing a power. It defines pow(0, 0) and pown(0, 0) as returning 1, and powr(0, 0) as returning NaN.
大多数编程语言都遵循0 ** 0 == 1的约定.对于整数和浮点参数，Python也不例外.
Most programming languages follow the convention that 0 ** 0 == 1. Python is no exception, both for integer and floating-point arguments.
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