Dean Fitzgerald - Currency Converter

currency_converter.py

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+from decimal import Decimal
+
+rates = [("USD", "EUR", 0.74), ("EUR", "JPY", 145.949)]
+cents = Decimal("0.01")
+
+
+def convert(rates, value, from_code, to_code):
+    """Take a monetary value in one currency and return a value in another
+        currency"""
+    if from_code == to_code:
+        return str(value) + " " + to_code
+    else:
+        returned_list = [(origin, destination, rate)
+                         for (origin, destination, rate)
+                         in rates if from_code == origin]
+        returned_tuple = returned_list[0]
+        returned_rate = returned_tuple[2]
+        new_value = returned_rate * value
+        return str(new_value) + " " + to_code
+
+
+def convert_reverse(rates, value, from_code, to_code):
+    returned_list = [(destination, origin, rate)
+                     for (destination, origin, rate)
+                     in rates if to_code == destination]
+    returned_tuple = returned_list[0]
+    returned_rate = returned_tuple[2]
+    new_value = Decimal(value / returned_rate).quantize(cents)
+    return str(new_value) + " " + to_code

more_tests.py

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+
+
+
+    # returned_list = [(origin, destination, rate) for (origin, destination, rate)
+    #                  in rates if from_code == origin]
+    # returned_tuple = returned_list[0]
+    # returned_rate = returned_tuple[2]
+    # new_value = returned_rate * value
+    # return new_value
+    # #return ("{} {}".format(return_value, to_code))

test_currency_converter.py

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+import currency_converter as cc
+rates = [("USD", "EUR", 0.74), ("EUR", "JPY", 145.949)]
+
+
+def test_one_to_one():
+    assert cc.convert(rates, 1, "USD", "USD") == "1 USD"
+
+
+def test_conversion_simple():
+    assert cc.convert(rates, 1, "USD", "EUR") == "0.74 EUR"
+
+
+def test_conversion():
+    assert cc.convert(rates, 0.5, "USD", "EUR") == "0.37 EUR"
+    assert cc.convert(rates, 2, "EUR", "JPY") == "291.898 JPY"
+
+
+def test_conversion_2_dollars():
+    assert cc.convert(rates, 2, "USD", "EUR") == "1.48 EUR"
+
+
+def test_reverse():
+    assert cc.convert_reverse(rates, 2, "EUR", "USD") == "2.70 USD"
+    assert cc.convert_reverse(rates, 145.949, "JPY", "EUR") == "1.00 EUR"