What is the Python equivalent for a case/switch statement?

The Question :

489 people think this question is useful

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

The Question Comments :
  • The second question is not a follow-up, and even follow-ups are to be posted as separate questions. In addition to that, it’s off topic, and should go on programmers.stackexchange.com. And, your first question is a duplicate.

The Answer 1

582 people think this answer is useful

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

For example:

# 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:

options[num]()

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

The Answer 2

193 people think this answer is useful

The direct replacement is if/elif/else.

However, in many cases there are better ways to do it in Python. See “Replacements for switch statement in Python?“.

Add a Comment