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things maybe instead you have an
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instance variable called self. names
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plural and you set it equal to a list of
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names or a list of houses now in this
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case I don't think that really solves a
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problem because I'm trying to implement
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a student singular so it doesn't really
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make sense to have multiple first names
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maybe a nickname maybe a last name so we
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could add those to but I don't think we
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need multiple names per se and in this
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case multiple houses but absolutely you
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could do that using some of our familiar
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building blocks like lists other
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questions how are classes or objects
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represented in memory how are classes
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and objects represented in memory so the
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class is technically just code it is the
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code on the top of my file lines one
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through four that defines that
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blueprints that template if you will um
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objects are stored in the computer's
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memory by taking up some number of byes
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so you're probably familiar with bytes
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or kilobytes or megabytes there's some
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chunk of bytes probably all in the same
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location in the computer's memory or Ram
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where those V where those objects are
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stored but that's what python the
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program handles for you python The
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Interpreter figures out where in the
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computer's memory to put it you and I
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the programmers get to think and solve
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problems at this level python The
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Interpreter handles those lower level
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details for you how about one final
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question on classes and objects no my
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question is if we can the same do the
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same thing with the dictionary so where
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to use classes good question if you can
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do the same things as you can with
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dictionaries why should you use classes
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because we are just scratching the
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surface now of what you can do with
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classes allow me to go back now to my
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keyboard and show you more of what you
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can do with classes but in short you can
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do much more with classes you can ensure
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the correctness of your data much more
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with classes you can error check things
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and generally you can design more
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complicated soft software more
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effectively and we'll continue to see
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today features of python and
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objectoriented programming more
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generally that allows us to do just that
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so let me propose in fact that first
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let's just tighten up this current
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implementation which again has us with
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an init method that just declares two
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instance variables self. name and self.
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house which again just creates those
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variables inside of the otherwise empty
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object and assigns them values name and
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house respectively let me go ahead and
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just do one little thing here I don't
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really need this student variable let me
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just tighten this up so that each time
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we improve or change the code we're
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focusing really on just the minimal
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changes alone so I've not fundamentally
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done anything different I just got rid
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of the variable name and I'm just
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returning the return value of this
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student function that's constructing my
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new object for me so I'm just tightening
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things up as we've done many times in
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the past well what if something goes
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wrong when in creating this student for
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instance what if the user does not give
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us a name and they just hit enter when
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prompted for name like I don't want to
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put in my computer's memory a sort of
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bogus student object that has no name
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right I'd ideally like to check for
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errors before I even create it so I
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don't create a nameless student it would
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just be weird and probably a bug to have
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an object that has no name similarly I
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don't want the user to be able to type
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in something random as their house at
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least in the World of Harry Potter
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there's really only four houses at
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Hogwarts at least or there's again
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Gryffindor and huffle and Ravenclaw and
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slitherin a list of four valid houses it
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would be nice if I somehow validated
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that the user's input is indeed in that
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list now I could do all of that
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validation in my get student function I
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