PyDIP, Python 3 - rextester

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#python 3.6.9
#PyDIP
#this code is created by Rezaul Hoque on January 20,2022;contact: jewelmrh@yahoo.com,Dhaka, Bangladesh
#note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;

from abc import ABC

class Converter(ABC):
    def exchange(self, from_currency, to_currency, amount) -> float:
        pass

class Exchanger1(Converter):
    def exchange(self, from_currency, to_currency, amount) -> float:
        print('Converting US Dollar into Tk')
        print(f'{amount} {from_currency} = {amount *83} {to_currency}')
        return amount * 83

class Exchanger2(Converter):
    def exchange(self, from_currency, to_currency, amount) -> float:
        print('Converting US Dollar into Taka')
        print(f'{amount} {from_currency} = {amount * 82} {to_currency}')
        return amount * 82

class Screen:
    def __init__(self, conv: Converter):
        self.conv= conv

def start(self):
        self.conv.exchange('USD', 'Tk', 100)

if __name__ == '__main__':
    exch= Exchanger1()
    screen = Screen(exch)
    screen.start()

[ + ] Show input
Absolute running time: 0.19 sec, cpu time: 0.04 sec, memory peak: 8 Mb, absolute service time: 0,36 sec