On 21/02/17 09:49, Rafael Knuth wrote:
> class FullPriceCustomer(object):
> def __init__(self, customer, rate, hours):
>
>
> class DiscountCustomer(FullPriceCustomer):
> discount = 0.7
> def calculate_discount(self, rate, hours):
>
> customer_one = DiscountCustomer("Customer A", 75, 100)
> customer_two = FullPriceCustomer("Customer B", 75, 100)
You create two instances and as such the
FullPriceCustomer.__init__() method gets
executed in both cases. This is because
the subclass does not provide an __init__()
of its own, so the inherited one is used.
Your discount is calculated in the
calculate_discount() method, but that is
never called. If you added a line:
customer_one.calculate_discount(75,100)
you would see the discount appear.
Alternatively create an init() for your
subclass that calls the superclass init()
then calls
self.calculate_discount(rate,hours)
BTW It's bad practice to mix calculations
and display(print) in the same method,
it's better to separate them, but
that's probably a topic for another thread
Get the inheritance sorted first :-)
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
Follow my photo-blog on Flickr at:
http://www.flickr.com/photos/alangauldphotos
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