main.py

import requests
from tabulate import tabulate

# Dictionary of available currencies
AVAILABLE_CURRENCIES = {
    "USD": "US Dollar",
    "EUR": "Euro",
    "GBP": "Pound Sterling",
    "CHF": "Swiss Franc",
    "NOK": "Norwegian Krone",
    "DKK": "Danish Krone",
    "CAD": "Canadian Dollar",
    "SEK": "Swedish Krona"
}

# Function fetches the current exchange rates for all currencies
def fetch_rates(currencies):
    try:
        symbols = ",".join(currencies.keys())
        response = requests.get(f"https://api.frankfurter.app/latest?base=PLN&symbols={symbols}")
        response.raise_for_status()
        data = response.json()
        return data["rates"], data.get("date", "N/A")
    except requests.RequestException:
        print("Error: Failed to connect to the API.")
        return None, None

# Main program loop
while True:
    try:
        print("\n" + "="*50)
        amount_pln = float(input("Enter amount in PLN: "))
        if amount_pln < 0:
            print("Error: Amount cannot be negative!")
            continue
    except ValueError:
        print("Error: Please enter a valid number!")
        continue
    
    rates, rate_date = fetch_rates(AVAILABLE_CURRENCIES)
    
    if rates:
        print(f"\nConverting {amount_pln} PLN to all available currencies:")
        print(f"Exchange rate date: {rate_date}")
        
        table_data = []
        for code, name in AVAILABLE_CURRENCIES.items():
            rate = rates.get(code)
            if rate:
                result = amount_pln * rate
                table_data.append([code, name, f"{result:.2f}", f"{rate:.4f}"])
        
        print(tabulate(table_data, headers=["Code", "Currency", "Amount", "Rate"], tablefmt="grid"))
    else:
        print("Error: Failed to fetch exchange rates.")
    
    # Ask the user if they want to perform another conversion
    while True:
        continue_choice = input("\nDo you want to convert another amount? (yes/no): ").strip().lower()
        if continue_choice == "yes":
            break
        elif continue_choice == "no":
            print("Goodbye!")
            exit(0)
        else:
            print("Invalid choice - please type 'yes' or 'no'.")