# 
factorial_value = {}


def factorial(n):
    if factorial_value.get(n) == None:
        result = 1
        for i in range(1, n + 1):
            result *= i
        factorial_value[n] = result
    else:
        print(f'Get from cache value factorial({n})')
        
    return factorial_value[n]


# ------------------------------------------------------------------------------


exchange_rates = {
    "USD": 1.0,
    "EUR": 0.861775,
    "GBP": 0.726763,
    "INR": 75.054725,
    "AUD": 1.333679,
    "CAD": 1.237816,
    "SGD": 1.346851,
}


def convert(fr, to, quontity):
    return round((quontity * (exchange_rates[to] / exchange_rates[fr])), ndigits=2)


def main():

    print(convert("USD", "AUD", 1000))
    print(convert("EUR", "USD", 100))


    '''
    print(factorial(5))
    print(factorial(3))
    print(factorial(6))
    print(factorial(5))
    print(factorial_value)
    '''


if __name__ == '__main__':
    # main()
    # print(dir())
    print(globals())