Joel Thompson homework

currency.py

@@ -0,0 +1,30 @@
+rates = [('USD', 'EUR', 0.86),
+         ('USD', 'JPY', 118.68),
+         ('GBP', 'USD', 1.51),
+         ('USD', 'CHF', 0.87),
+         ('USD', 'CAD', 1.21),
+         ('EUR', 'JPY', 137.08),
+         ('AUD', 'USD', 0.82)]
+
+
+def get_rate(start, to):
+    """Returns the exchange rate based on the starting currency to the ending
+    currency."""
+    for tup in rates:
+        if start == tup[0] and to == tup[1]:
+            rate = tup[2]
+            return rate
+        elif start == tup[1] and to == tup[0]:
+            rate = round(1/tup[2], 2)
+            return rate
+
+
+def convert(rates, value, start, to):
+    """Takes a value and applies the correct exchange rate and returns the
+    result."""
+    rate = get_rate(start, to)
+    if start == to:
+        return value
+    else:
+        rate = get_rate(start, to)
+        return value * rate

test_currency.py

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+from currency import *
+
+rates = [('USD', 'EUR', 0.86),
+         ('USD', 'JPY', 118.68),
+         ('GBP', 'USD', 1.51),
+         ('USD', 'CHF', 0.87),
+         ('USD', 'CAD', 1.21),
+         ('EUR', 'JPY', 137.08),
+         ('AUD', 'USD', 0.82)]
+
+
+def test_convert_same():
+    assert convert(rates[0][2], 1, 'USD', 'USD') == 1
+
+
+def test_convert_USDtoEUR():
+    assert convert(rates[0][2], 1, 'USD', 'EUR') == 0.86
+
+
+def test_value_other_than_1():
+    assert convert(rates[0][2], 2, 'USD', 'EUR') == 1.72
+
+
+def test_convert_EURtoUSD():
+    assert convert(rates[1][2], 1, 'EUR', 'USD') == 1.16
+
+
+def test_get_rate_normal():
+    assert get_rate('USD', 'EUR') == 0.86
+
+
+def test_get_rate_inverse():
+    assert get_rate('EUR', 'USD') == 1.16
+
+
+def test_convert_GBPtoUSD():
+    assert convert(rates, 2, 'GBP', 'USD') == 3.02
+
+
+def test_convert_USDtoGBP():
+    assert convert(rates, 2, 'USD', 'GBP') == 1.32
+
+
+def test_convert_EURtoJPY():
+    assert convert(rates, 3, 'EUR', 'JPY') == 411.24