[Tutor] Passing perimeters in dictionary values?

[Alan Gauld]

"nathan virgil" <sdragon1984 at gmail.com> wrote in

> selection = raw_input("Choice: ")
> choices = {"0":quit, "1":crit.talk, "2":crit.eat, "3":crit.play}
> choice = choices[selection]
> choice()
>
> so that I can call methods from a dictionary, instead of having an
> excruciatingly long if structure. Unfortunately, the problem I'm 
> running
> into with this is that I can't pass any perimeters through the 
> dictionary.

Yes you can.

choice(x)

will work

as will

choices[selection](param)

So you can do something like:

selection = raw_input("Choice: ")
param = raw_input('Value: ')
choices = {"0":quit, "1":crit.talk, "2":crit.eat, "3":crit.play}
choice = choices[selection]
choice(param)

Or you can build the param value into the dictionary:

selection = raw_input("Choice: ")
choices = {
"0":(quit, None),
"1":(crit.talk, "Hi there"),
"2":(crit.eat, "Nuts"),
"3": (crit.play, "Soccer")
"4": (crit.play, "Baseball")}      # same func different param
choice = choices[selection]
choice[0](choice[1])

There are plenty other ways too.
I
> can't figure out how, for example, I could have an option that calls
> crit.eat(2) and another that calls crit.eat(4).

The question is where are the 2 and 4 coming from?
You could read them from the user or a file in option 1 above
or store them with the function under a different menu in option 2.
Or of course you could just hard code them at call time...

It depends how you want to use it...

-- 
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/