case / switch语句的Python等价物是什么？ [重复]

本文翻译自：What is the Python equivalent for a case/switch statement? [duplicate]

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这个问题在这里已有答案：

• Replacements for switch statement in Python? Python中的switch语句的替换？ 44 answers 44个答案

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

我想知道，是否有一个Python等效的case语句，如VB.net或C＃上提供的示例？

#1楼

参考：https://stackoom.com/question/mAQK/case-switch语句的Python等价物是什么-重复

#2楼

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

虽然官方文档很乐意不提供切换，但我看到了使用词典的解决方案 。

For example:

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,
}
           

Then the equivalent switch block is invoked:

然后调用等效的开关块：

options[num]()
           

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

如果你严重依赖于跌倒，这就开始分崩离析了。

#3楼

The direct replacement is

if

/

elif

/

else

.

直接替换是

if

/

elif

/

else

。

However, in many cases there are better ways to do it in Python.

但是，在许多情况下，有更好的方法在Python中执行此操作。

See " Replacements for switch statement in Python? ".

请参阅“ Python中的switch语句的替换？ ”。