Hi Justin,
Thank you so much for your kind explaining. it's awesome.
Since I change the code to
def add_coconut(self, name):
if not isinstance(name, Coconut):
raise AttributeError("%s isn't type of coconut can be
stored."%(name))
self.coconuts.append(name)
So the way I implement my code is call
SouthAsian = Coconut()
stack = Inventory()
stack.add_coconut(SouthAsian)
Is this correct?
Also if I want to print out the list type object of the stack, how to use
__repr__ for
this case, I know the way for the string type but not for the list type.
Thanks again!!
Matt
On Sat, Sep 21, 2013 at 7:35 PM, Justin Israel <[email protected]>wrote:
> Seems like that approach will work just fine, aside from a couple small
> adjustments:
>
> In your add_coconut method, you will want to be checking for an instance
> of Coconut, instead of Inventory.
>
> You could also increase the efficiency of your total_weight() method by
> tracking the weight from inside of the add_coconut() call.
> This way, all you have to do is return a value instead of looping the
> inventory every time.
>
> With the previous suggestion, it would then be best to make the coconuts
> list a private attribute so that people wouldn't be modifying the
> list directly and messing with your optimized tracking.
> self.__coconuts = []
>
> If they ask you later to track the coconuts by their type, you may find
> yourself wanting to switch to a dictionary, where the key would be the
> product type (Coconut)
> and the value could be a list of those coconuts.
>
>
>
> On Sep 22, 2013, at 1:41 PM, matthew park wrote:
>
> Hi there I am doing a assignment and the code should be simple as soon as
> I get
> what the question is meaning.
>
> The assignment is
>
> Create *Inventory class* that tracks different types of coconuts from
> around the world. The different types of coconuts must have these weight
> attribute values:
>
> Type
>
> Weigt
>
> South Asian
>
> 3
>
> Middle Eastern
>
> 2.5
>
> American
>
> 3.5
>
> The inventory class must have the following methods:
>
> -
>
> add_coconut() accepts a coconut as an argument. Other types throw an
> AttributeError.
>
> total_weight() provides the total weight of coconuts.
>
>
> The code that I am thinking of now is below
>
> class Inventory(object):
> def __init__(self):
> self.coconuts = []
>
> def add_coconut(self, cocoType):
> if not isinstance(cocoType, Inventory):
> raise AttributeError("%s isn't type of Coconut can be
> added"(cocoType))
> self.coconuts.append(cocoType)
>
> def total_weights(self):
> totalWeight = 0.0
> for each in coconuts:
> totalWeight += each.weight
>
>
> class Coconut(object):
> weight = 0.0
>
> class SouthAsian(Coconut):
> weight = 3.0
>
> class MiddleEastern(Coconut):
> weight = 2.5
>
> class American(Coconut):
> weight = 3.5
>
>
>
> Thank you so much for your help!
>
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