python - case / switch语句的Python等价物是什么？ [重复](What is the Python equivalent for a case/switch statement? [duplicate])

Question

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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？)

  ask by user1524844 translate from so

Answer 1

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.
"

def sqr():
    print "n is a perfect square
"

def even():
    print "n is an even number
"

def prime():
    print "n is a prime number
"

# 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。)