Currency Converter First Deployment

api.py

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+import requests
+
+BASE_URL = "https://api.frankfurter.app"
+
+def get_currencies():
+    """
+    Fetch the list of available currencies from Frankfurter API.
+    Returns a list of currency codes.
+    """
+    response = requests.get(f"{BASE_URL}/currencies")
+    if response.status_code == 200:
+        currencies = response.json()
+        return list(currencies.keys())
+    else:
+        raise Exception("Failed to fetch currencies")

app.py

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+import streamlit as st
+from api import get_currencies
+from frankfurter import get_latest_rate, get_historical_rate
+from currency import format_conversion_result
+from datetime import datetime
+
+st.title("Currency Converter")
+
+# Fetch available currencies
+currencies = get_currencies()
+
+# Input elements
+amount = st.number_input("Enter the amount to be converted:", min_value=0.0, value=100.0)
+from_currency = st.selectbox("From currency:", currencies)
+to_currency = st.selectbox("To currency:", currencies)
+
+# Latest conversion rate button
+if st.button('Get Latest Rate'):
+    try:
+        rate = get_latest_rate(from_currency, to_currency)
+        inverse_rate = 1 / rate if rate != 0 else 0
+        converted_amount = amount * rate
+        result = format_conversion_result(datetime.today().strftime('%Y-%m-%d'), from_currency, to_currency, rate, amount, converted_amount, inverse_rate)
+        st.write(result)
+    except Exception as e:
+        st.write(f"Error: {e}")
+
+# Historical conversion rate
+selected_date = st.date_input("Select a historical date:")
+if st.button('Conversion Rate'):
+    try:
+        rate = get_historical_rate(from_currency, to_currency, selected_date)
+        inverse_rate = 1 / rate if rate != 0 else 0
+        converted_amount = amount * rate
+        result = format_conversion_result(selected_date, from_currency, to_currency, rate, amount, converted_amount, inverse_rate)
+        st.write(result)
+    except Exception as e:
+        st.write(f"Error: {e}")

currency.py

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+def format_conversion_result(date, from_currency, to_currency, rate, from_amount, to_amount, inverse_rate):
+    return f"""
+    The conversion rate on {date} from {from_currency} to {to_currency} was {rate:.5f}.
+    So {from_amount:.1f} in {from_currency} corresponds to {to_amount:.2f} in {to_currency}.
+    The inverse rate was {inverse_rate:.4f}.
+    """

frankfurter.py

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+import requests
+
+BASE_URL = "https://api.frankfurter.app"
+
+def get_latest_rate(from_currency, to_currency):
+    """
+    Fetch the latest conversion rate from Frankfurter API.
+    
+    Args:
+        from_currency: Currency code to convert from.
+        to_currency: Currency code to convert to.
+    
+    Returns:
+        The latest conversion rate.
+    """
+    response = requests.get(f"{BASE_URL}/latest?from={from_currency}&to={to_currency}")
+    if response.status_code == 200:
+        data = response.json()
+        return data['rates'][to_currency]
+    else:
+        raise Exception("Failed to fetch the latest rate")
+
+def get_historical_rate(from_currency, to_currency, date):
+    """
+    Fetch the historical conversion rate for a specific date from Frankfurter API.
+    
+    Args:
+        from_currency: Currency code to convert from.
+        to_currency: Currency code to convert to.
+        date: Date for which to fetch the rate (in YYYY-MM-DD format).
+    
+    Returns:
+        The historical conversion rate.
+    """
+    response = requests.get(f"{BASE_URL}/{date}?from={from_currency}&to={to_currency}")
+    if response.status_code == 200:
+        data = response.json()
+        return data['rates'][to_currency]
+    else:
+        raise Exception("Failed to fetch historical rate")

requirements.txt

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+streamlit
+requests