Currency Converter Assignment

currency.py

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+#!/bin/python
+
+rates = [("USD", "EUR", 0.86), ("EUR", "JPY", 137.05)]
+
+
+def convert(rates, value, from_a, to_b):
+    """Convert one currency stright to another using current exchange rate"""
+    if from_a == to_b:
+        return value
+    else:
+        new_list = [(start, end, rate)
+                    for (start, end, rate)
+                    in rates if from_a == start]
+        elput = new_list[0]
+        new_rate = elput[2]
+        new_value = new_rate * value
+        return round(new_value, 2)
+
+
+def convert_backwards(rates, value, from_a, to_b):
+    """Convert one currency to another using the reverse function"""
+    new_list = [(end, start, rate)
+                for (end, start, rate)
+                in rates if to_b == start]
+    elput = new_list[0]
+    new_rate = elput[2]
+    new_value = (value / new_rate)
+    return round(new_value, 2)

test_currency.py

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+#!/bin/python
+import currency as cy
+
+rates = [("USD", "EUR", 0.86), ("EUR", "JPY", 137.05)]
+
+
+def test_dollar_for_dollar():
+    assert cy.convert(rates, 1, "USD", "USD") == 1
+
+
+def test_conversion():
+    assert cy.convert(rates, 1, "USD", "EUR") == .86
+
+
+def test_converting_more():
+    assert cy.convert(rates, 444, "EUR", "JPY") == 60850.2
+
+
+def test_convert_backwards():
+    assert cy.convert_backwards(rates, 323, "EUR", "USD") == 44267.15
+
+
+def test_convert_backwards():
+    assert cy.convert_backwards(rates, 500, "JPY", "EUR") == 581.4
+
+
+def test_convert_backwards():
+    assert cy.convert_backwards(rates, 2, "JPY", "EUR") == 2.33