case/switch 语句的 Python 等效项是什么?

本文介绍了case/switch 语句的 Python 等效项是什么?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我想知道，是否有 Python 等效的 case 语句，例如 VB 或 C# 上可用的示例?

I'd like to know, is there a Python equivalent for the case statement such as the examples available on VB or C#?

推荐答案

虽然官方文档 很高兴不提供 switch，我看到了一个 解决方案使用字典.

While the official docs are happy not to provide switch, I have seen a solution using dictionaries.

例如:

# define the function blocks def zero(): print "You typed zero.\n" def sqr(): print "n is a perfect square\n" def even(): print "n is an even number\n" def prime(): print "n is a prime number\n" # map the inputs to the function blocks options = {0 : zero, 1 : sqr, 4 : sqr, 9 : sqr, 2 : even, 3 : prime, 5 : prime, 7 : prime, }

然后调用等效的 switch 块:

Then the equivalent switch block is invoked:

options[num]()

如果您严重依赖跌倒，这将开始分崩离析.

This begins to fall apart if you heavily depend on fall through.