[Tutor] [Tutor} Why doesn't it choose a new number each time?

Alan Gauld alan.gauld at btinternet.com
Thu Feb 15 10:05:27 CET 2007

"Nathan Pinno" <falcon3166 at hotmail.com> wrote

> But can anyone explain why I can shorten the code?

There are a few things you could do but one very powerful
trick is to use a table driven approach. Thus:

rps = {0:'rock',1:'paper',2:'scissors'}  # use zero to match list 

results = [
                # zeroth item AI chose rock
                 ['You chose Rock : Tied Game',
                  'You chose Paper: You win!',
                  'You chose scissors, AI Wins!'],
                # index one is AI chose paper
                 ['You chose Rock, AI Wins!'
                # index 3 AI chose scissors
                 ['You chose Rock, You win!', ....etc]

Now all your if/else logic becomes:

tool = choice(range3))
user = int(raw_input(....)
print 'AI chose ', rps[tool], results[tool][user]

And you can reduce that further by using multiple tables
of strings and the results table simply becomes a collection
of indexes into those tables. This is starting to get into a
database topic called normal forms which is probably a
tad advanced for this case!


Alan G.

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