case-statement

I'm perplexed. At CodeRage today, Marco Cantu said that CharInSet was slow and I should try a Case statement instead. I did so in my parser and then checked with AQTime what the speedup was. I found the Case statement to be much slower. 4,894,539 executions of: while not CharInSet (P^, [' ', #10,#13, #0]) do inc(P); was timed at 0.25 seconds. But the same number of executions of: while True do case P^ of ' ', #10, #13, #0: break; else inc(P); end; takes .16 seconds for the "while True", .80 seconds for the first case, and .13 seconds for the else case, totaling 1.09 seconds, or over 4 times as

What is the difference between case item.class when MyClass # do something here when Array # do something different here when String # do a third thing end and case item.class when MyClass.class # do something here when Array.class # do something different here when String.class # do a third thing end For some reason, the first one of these works sometimes and the second doesn't, and other times, the second one works and the first one doesn't. Why? Which one is the "proper" way to do it? Nakilon You must use: case item when MyClass ... I had the same problem: How to catch Errno::ECONNRESET

This question already has an answer here: Replacements for switch statement in Python? 44 answers I'd like to know, is there a Python equivalent for the case statement such as the examples available on VB.net or C#? 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 :