Python "yield" keyword to calculate

Question

A bar shop has a ten-day promotion. During this period, the price of an beer drops 10 percent each day. For example, a beer that costs 10$ on the first day costs $9 on the second day and $8.1 on the third day.

I want to write a python function that uses yield keyword to calculate beer price each day.

For instance if we give input 10, My expected output is:

Price is discounted to : 9

Price is discounted to : 8.1

..etc

class DiscountCalc:
    def get_item_price(self):
        return input('Input a starting price (0 to quit): ')


    def discount(self, current_price, days):
        yield (current_price - (current_price*10)//100)



    def run(self):
        initial = self.get_item_price()
        for price in self.discount(initial, 10):
            print "Price is discounted to : " + str(price)

DiscountCalc().run()

So, what exactly is your question? As an side, this class seems pretty... unnecessary. There isn't any internal state. — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Dec 6, 2017 at 19:15
If I add the "yield (current_price - (current_price*10)//100)" to my discount class, I am getting input as only "Price is discounted to : 9" which is onlay first day, but I want to get result for other days too. — Alice
– Alice, Commented Dec 6, 2017 at 19:18
Please edit your question with the code you are using that is not working. I cannot tell what exactly you mean by "If I add the "yield (current_price - (current_price*10)//100)" to my discount class". Add it where? — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Dec 6, 2017 at 19:20
@Alice Please put your attempt with the yield statement in the question with the description of what it's doing and what you expect it to do. — glibdud
– glibdud, Commented Dec 6, 2017 at 19:20
I did, as you see I add my yield statement to my discount class, it is only giving output as only for one day, I want to get output for other days too, Probably I will use loop but, how? — Alice
– Alice, Commented Dec 6, 2017 at 19:23

Shailyn Ortiz · Accepted Answer · 2017-12-06 19:29:14Z

2

it's due to the cycle, this should fix it:

def discount(self, current_price, days):
    for day in range(days):
        yield current_price
        current_price = current_price * 0.9


def run(self):
    initial = self.get_item_price()
    for price in self.discount(initial, 10):
        print(price)

answered Dec 6, 2017 at 19:29

Shailyn Ortiz

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