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operator Plus in between that is to say
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if I go back to VSS code here what I'm
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trying to do is Implement support for
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this well let me try without writing any
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other code just yet python a vault up
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high enter type error unsupported
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operand types for Vault and Vault that
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is to say python at this moment does not
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know what it means to add two vaults
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together right you and I might have an
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instinct probably want to combine the
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gallions and the sickles and the canuts
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respectively python doesn't know that it
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just knows that you have a new class
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called Vault but let's teach python to
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do this let me clear my terminal window
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let me scroll back up to the class
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itself where at the moment I only have
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two special methods in it and stir but
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let's add this third all right let me go
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into the class here and Define
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underscore uncore add underscore
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underscore and then specify its first
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parameter as self as before and then a
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second parameter for this particular
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method called by convention other now as
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always I could name those parameters
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anything I want but I'm going to stick
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with convention Here and Now inside of
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this method am I going to have to now
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add together the contents of two vaults
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well what two vaults well if we scroll
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down to our goal at hand the goal goal
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of course is to add this Vault plus this
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other Vault Potter plus Weasley
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respectively well it turns out in Python
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that when you do overload an operator
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like Plus what's going to happen
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automatically as soon as python sees
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that is it's going to call that
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underscore underscore ad underscore
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uncore method and it's going to pass
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into it two arguments whatever the
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operand is on the left Potter in this
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case and whatever the operand is on the
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right Weasley in this case and those
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values are going to get passed in as
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self and other respectively what that
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means is that we can access their
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contents up here in our implementation
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of AD as follows let me go ahead and
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Define a local variable called gallions
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and set that equal to for instance the
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sum of self dot gallions whatever's in
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uh Potter's vault in this case plus
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whatever is in Weasley's vault in this
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case which would be other. gallions let
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me do the same for sickles self. sickles
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plus other Doles and let me lastly do
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that for canuts so self. canuts Plus
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other. canuts
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but at the end of the day I'm going to
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need to return a brand new bigger Vault
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that contains all of those contents
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together and if we ultimately want to
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assign that bigger Vault to a variable
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like total here on the left we better
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indeed return a value from this ad
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method so I'm going to go ahead and give
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myself a brand new vault as by returning
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Capital vault which of course is going
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to call My Vault function into which I
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can now pass some of those
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3.44
initialization arguments well how many
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gallion sickles and canuts do I want
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this brand new Vault to contain well I
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want it to contain this many gallions
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this many sickles and this many canuts
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so ultimately what we're doing in this
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implementation of ad is adding together
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those gallion sickles and canuts passing
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them to the Vault function so that we
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get a brand new bigger Vault and return
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that Al together so now I've defined
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this new special method called add that
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should now just make Plus work for two
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vaults all right let's see let me run
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down to my terminal window python a
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vault high and hit enter and voila now
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we've implemented an overloaded operator
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plus to do what you and I as humans
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would hope would be the case when you
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add two vaults together but I've now
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written the code more specifically to
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teach python what it means concretely to
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add two vaults together and it's with
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very similar code in effect underneath
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the hood that python is doing this for
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two strings to concatenate them together
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to joining two lists into a new list
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