python - 为什么 0 ** 0 在 python 中等于 1

Question

为什么 0 ** 0 在 Python 中等于 1？它不应该像 0/0 那样抛出异常吗？

Answer 1

维基百科对 history and the differing points of view on 有有趣的报道。 0 ** 0的值:

The debate has been going on at least since the early 19th century. At that time, most mathematicians agreed that 0 ** 0 = 1, until in 1821 Cauchy listed 0 ** 0 along with expressions like 0⁄0 in a table of undefined forms. In the 1830s Libri published an unconvincing argument for 0 ** 0 = 1, and Möbius sided with him...

应用于计算机时，IEEE 754推荐了几个计算幂的函数。它将 pow(0, 0) 和 pown(0, 0) 定义为返回 1 和 powr(0, 0) 作为返回 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 也不异常(exception)。