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So that was my introduction into development on Python itself.
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人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用，这一点在雷电模拟器官方版本下载中也有详细论述
23:05, 3 марта 2026Мир
Commutativity and associativity might sound the same, and indeed most commutative operations are also associative. But there are a few math operations that are only one or the other. Matrix multiplication, for example, is associative but not commutative Matrix multiplication - Wikipedia en.wikipedia.org/wiki/Matrix_multiplication#Non-commutativity . And surprisingly, floating point arithmetic — i.e. any math operator in JavaScript — is commutative but not associative Associative property - Wikipedia en.wikipedia.org/wiki/Associative_property#Nonassociativity_of_floating_point_calculation ! ↩，更多细节参见爱思助手下载最新版本