#!/usr/bin/env python3

import sys
import requests

def convert_currency(amount, from_currency, to_currency):
    url = f"https://api.frankfurter.app/latest?amount={amount}&from={from_currency}&to={to_currency}"
    response = requests.get(url)
    if response.status_code == 200:
        data = response.json()
        converted_amount = data['rates'][to_currency]
        print(f"{amount} {from_currency} = {converted_amount} {to_currency}")
    else:
        print("Error: Unable to fetch exchange rates.")

def main():
    if len(sys.argv) != 4:
        print("Usage: currency_converter.py <amount> <from_currency> <to_currency>")
        print("Example: currency_converter.py 100 CAD USD")
        sys.exit(1)

    amount = float(sys.argv[3])
    from_currency = sys.argv[1].upper()
    to_currency = sys.argv[2].upper()

    convert_currency(amount, from_currency, to_currency)

if __name__ == "__main__":
    main()