Python for Absolute Beginners Transcripts
Chapter: Error handling
Lecture: Where are the invalid numerals
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Well, let's fix this crashing program
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that we've got going on here.
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Notice we're over in error handling, rps error handling.
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This is in CH11 in the GitHub repository.
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And I've already sort of set this up a little bit for us.
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We've got the rpsgame, and it should look really familiar.
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Except for there's a few issues
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we're going to solve that in a second
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but this starts up and it's going to say
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Oh, not external libraries but error handling addition.
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So what we've done is we've taken
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the external libraries edition, CH10
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and we've copied it over with some small changes.
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Remember the way it worked before is
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we gave it that cool dropdown thing
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where it could figure out what, you know
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what you're starting to type like a
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Oh do you want to type error
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and it would just complete that for us.
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We've fallen back in a bit in our get roll here.
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Where we're going to get the input from the user
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and we're converting it to an integer again.
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Specifically 'cause that's a super easy way
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for us to crash the program.
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Now, notice there's some requirements that are
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here we got to install from our requirements file.
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There's a couple of options.
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We can click this button, and that's great
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or we can come down here.
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Make sure your virtual environment is active
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and you can say, pip install -r
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requirements.txt and it'll complete that for us.
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Cool, now we should be able to run this program.
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We don't care about this extension for
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the requirements.txt.
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A lot of the extensions in PyCharm are awesome.
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They've got great ones for like, CSVs
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and Nginx files, and all kinds of stuff.
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But for some reason the requirement one
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messes with that little dialogue
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that you just saw there, that yellow bar
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so I don't use it.
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Anyway, we're ready to run our game here.
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Let's see that it works.
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Let's see that everything is working good.
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Yes, my name is Michael, or is it Crash Bandit?
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Okay, seven, yeah, not so much.
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That's not great. But one thing that's cool about PyCharm
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is when you do have an error
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notice over here on the right you can see
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the various places where this is happening
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and we can just click right here
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and yeah bump that down a little bit
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and it takes us right to the line where
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the error first happened.
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Well, here's where the error is.
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So you can see what's going on.
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We're passing in seven as like this
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and it really wants us to pass in that
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the numeral 7, but it's not going to happen, is it?
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So it's this error right here, and in fact
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we can sort of guard against this whole bit right there
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to make sure that everything is working correctly.
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We'll see how to do that next.
