Python for Absolute Beginners Transcripts
Chapter: Problem solving techniques for writing software
Lecture: Demo: Play until someone wins
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The next thing we need to do, that's not checked off
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is we have to go and play until someone wins.
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So, notice I put some comments in here
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create the board, choose initial player.
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I wanted to put that in there to kind of highlight
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what problem solving bit we were doing.
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Also, I've decided to just call this symbols.
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I don't want that to be super, super long
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until we work with it.
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So here we're going to being doing until
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Well, how do we do that?
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Remember, I said at the beginning
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that until a condition is True or False
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that's going to be a while loop
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and what we have to do is put some kind of test in here
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like check or find winner.
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What we want to do is actually go
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and look through this board
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and see if there's somebody that has X, X, X
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or O, O, O or more tricky X, X, X and things like that.
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We're not going to do that yet, but because that's complicated
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let's write a function and pass the board over there
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and maybe we need to pass some more information.
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For now, I think we're just going to pass the board
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and we'll say yeah, there's a winner
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or something like that, but it could be
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that we want to pass this over so it can say
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you know, you are the winner or computer's the winner.
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We'll have another way to keep track of that actually.
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So, we're going to find a winner.
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Now, notice, this has got red curlies.
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That means find winner doesn't exist yet
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but it will, it will
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and then we're just going to go play a round
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a round like this.
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So we've got to go and create this function.
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Remember, your function stuff from earlier
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we can go and type def, this, and do the bits
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or we could just hit alt, enter in PyCharm
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and say create the function.
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Don't really like that it puts it at the top
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but it's the safest thing it can do
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but it's because the way main works
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it's not necessarily you want main to be the top.
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Okay, so let's just for now return false.
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We are going to take a while to figure out who the winner is.
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This is going to be a really elegant solution
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but it's going to take a little bit of thinking through
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so let's not worry about that now.
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We're not at that step yet
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but it definitely has uncovered the need
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for us to be able to, given a board
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and how it's been played
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determine, has anybody won this just yet.
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Before we worry about the winners
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let's figure out how we might just play a round.
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Now, let's go ahead and run it
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and have a little bit of fun, see what happens.
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Ah, yes, so I had that backwards.
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It's going to do this as long as it finds a winner.
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No, you play the game as long as
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there's not finding a winner.
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There we go.
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Play a round, play a round
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oh my gosh, it's an infinite loop, stop.
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There we go, stop, stop, stop.
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Well, that part works.
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We're doing it over and over as you saw
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and we're checking for a winner.
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Right now we can have a to do
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implement how we check for a winner.
