[Tutor] (no subject)
kent37 at tds.net
Sat Mar 5 15:53:56 CET 2005
Jacob S. wrote:
> while 1:
> play = raw_input("What is your choice? ")
> if play in options.keys(): ## This makes sure that the user
> input is one of our options
'if play in options' is preferable. options.keys() returns a list of keys that will be searched
sequentially. options is a dict which supports fast direct lookup. So when you say 'if play in
options.keys()' not only do you type more but you generate an intermediate list and use a slower
form of search!
> options[play]() ## Call the function that is the
> value of the key that is the choice the user made
> else: ## Say that the user input
> is not one of your choices...
> print "\nYou need to pick 1, 2 or 3 or hit enter to see choices\n"
But even better is to make the error message a default option:
print "\nYou need to pick 1, 2 or 3 or hit enter to see choices\n"
Then the lookup becomes just
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