Currency Converter Normal Mode

README_Ana.md

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+currency_converter.py should be called with no arguments.
+
+convert function takes a list of tuples of the form (curr1,curr2,rate)
+where each tuple has 3 elements:
+currency1
+currency2
+the exchange rate to convert from currency1 to currency2
+
+and 3 more arguments: currency one, currency 2 and the value to be converted

currency_converter.py

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+
+def get_exchange_rate(rates, cu_from, cu_to):
+    exch_tuple = [conv_element
+                  for conv_element in rates
+                  if cu_from in conv_element and cu_to in conv_element]
+    if exch_tuple == []:
+        return 0
+    else:
+        if cu_from == exch_tuple[0][0]:
+            return exch_tuple[0][2]
+        else:
+            return (1/exch_tuple[0][2])
+
+
+def convert(rates, value, cu_from, cu_to):
+    if cu_from == cu_to:
+        return value
+    else:
+        exch_converter = get_exchange_rate(rates, cu_from, cu_to)
+        return exch_converter*value

test_currency.py

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+from currency_converter import *
+
+
+rates = [("USD", "EUR", 0.74), ("EUR", "JPY", 145.949)]
+
+
+def test_get_exchange_rate():
+    assert get_exchange_rate(rates, "USD", "EUR") == 0.74
+    assert get_exchange_rate(rates, "EUR", "JPY") == 145.949
+    assert get_exchange_rate(rates, "USD", "JPY") == 0
+    assert get_exchange_rate(rates, "JPY", "EUR") == 1 / 145.949
+    assert get_exchange_rate(rates, "EUR", "USD") == 1 / 0.74
+
+
+def test_convert():
+    assert convert(rates, 1, "USD", "USD") == 1
+    assert convert(rates, 1, "USD", "EUR") == 0.74
+    assert convert(rates, 1, "POU", "EUR") == 0
+    assert convert(rates, 2, "USD", "EUR") == 1.48
+    assert convert(rates, 2, "EUR", "JPY") == 291.898
+    assert convert(rates, 2, "EUR", "USD") == 2 * 1 / 0.74
+    assert convert(rates, 2, "JPY", "EUR") == 2 * 1 / 145.949