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    <p>I would use:</p> <ul> <li>A dictionary to validate and normalize currency, rather than ad-hoc lists</li> <li>A loop to get valid input from the user, rather than recursion</li> <li>The <code>.lower()</code> method to normalize case</li> </ul> <p>My refactored version:</p> <pre><code>CURRENCY = { '¥': 'JPY', 'yen': 'JPY', 'jpy': 'JPY', '€': 'EUR', 'euro': 'EUR', 'eur': 'EUR', '$': 'USD', 'dollar': 'USD', 'usd': 'USD', '£': 'GBP', 'pound': 'GBP', 'gbp': 'GBP', } def read_currency(prompt): """Prompt the user to enter a currency. Returns a currency code. """ while True: x = input(prompt) try: return CURRENCY[x.lower()] except KeyError: print('Unknown currency: {!r}'.format(x)) </code></pre> <p>You can then calculate conversion rates how you like:</p> <pre><code>from decimal import Decimal RATES = { 'JPY': Decimal("0.010589"), 'EUR': Decimal("1.2983"), 'GBP': Decimal("1.5228"), 'USD': Decimal("1.0000"), } def conversion_rate(cur1, cur2): """Get the conversion rate from currency 1 to currency 2.""" return RATES[cur1] / RATES[cur2] </code></pre> <p>And here is code for the conversion:</p> <pre><code>amount = Decimal(input('Enter amount: ')) currency1 = read_currency('Enter source currency: ') currency2 = read_currency('Enter target currency: ') rate = conversion_rate(currency1, currency2) print('{} {} is equal to {} {}' .format(currency1, amount, currency2, amount * rate)) </code></pre> <p>Note that there are better rules for rounding you may want to apply.</p> <p>Example run:</p> <pre> Enter amount: 1450 Enter source currency: yen Enter target currency: $ JPY 1450 is equal to USD 15.3700 </pre>
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    1. COHey, thanks, but the thing is, I need the whole list later on in the code. There will be many errors if I use your code^^
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    2. COApart from the fact that you should probably refactor your code to make this work (because this is a very tidy way to do it) you can just use CURRENCY.keys() to get your original list.
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    3. CO@jhoyla: You'll need `list(CURRENCY.keys())`, since this is Python 3, but that's right.
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