From 18a49d48587b3b6dcaa5949cbef3f6022ebfdc5a Mon Sep 17 00:00:00 2001
From: grizax <ndbfoster@gmail.com>
Date: Wed, 21 Jan 2015 00:38:19 -0500
Subject: [PATCH 1/4] Conversion created with basic tests run thru

---
 currency.py      | 17 +++++++++++++++++
 test_currency.py | 10 ++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 currency.py
 create mode 100644 test_currency.py

diff --git a/currency.py b/currency.py
new file mode 100644
index 0000000..3298f43
--- /dev/null
+++ b/currency.py
@@ -0,0 +1,17 @@
+#!/bin/python
+
+rates = [("USD", "EUR", 0.86), ("EUR", "JPY", 136.28)]
+
+
+def convert(rates, value, from_a, to_b):
+    """Convert one currency to another using the 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 new_value
diff --git a/test_currency.py b/test_currency.py
new file mode 100644
index 0000000..a34bbd4
--- /dev/null
+++ b/test_currency.py
@@ -0,0 +1,10 @@
+#!/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

From dfd49c8b98346675a9b91b9c0a60071f8c2820ec Mon Sep 17 00:00:00 2001
From: grizax <ndbfoster@gmail.com>
Date: Wed, 21 Jan 2015 00:56:57 -0500
Subject: [PATCH 2/4] Add another test converting more complicated conversions

---
 currency.py      | 4 ++--
 test_currency.py | 6 ++++++
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/currency.py b/currency.py
index 3298f43..5692886 100644
--- a/currency.py
+++ b/currency.py
@@ -1,6 +1,6 @@
 #!/bin/python
 
-rates = [("USD", "EUR", 0.86), ("EUR", "JPY", 136.28)]
+rates = [("USD", "EUR", 0.86), ("EUR", "JPY", 137.05)]
 
 
 def convert(rates, value, from_a, to_b):
@@ -14,4 +14,4 @@ def convert(rates, value, from_a, to_b):
         elput = new_list[0]
         new_rate = elput[2]
         new_value = new_rate * value
-        return new_value
+        return round(new_value, 2)
diff --git a/test_currency.py b/test_currency.py
index a34bbd4..f254c8f 100644
--- a/test_currency.py
+++ b/test_currency.py
@@ -3,8 +3,14 @@
 
 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

From a2418b018a623dd2a67c9102018214643ce77562 Mon Sep 17 00:00:00 2001
From: grizax <ndbfoster@gmail.com>
Date: Wed, 21 Jan 2015 01:25:39 -0500
Subject: [PATCH 3/4] Added the backwards convert

---
 currency.py      | 13 ++++++++++++-
 test_currency.py |  8 ++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/currency.py b/currency.py
index 5692886..698cf9f 100644
--- a/currency.py
+++ b/currency.py
@@ -4,7 +4,7 @@
 
 
 def convert(rates, value, from_a, to_b):
-    """Convert one currency to another using the current exchange rate"""
+    """Convert one currency stright to another using current exchange rate"""
     if from_a == to_b:
         return value
     else:
@@ -15,3 +15,14 @@ def convert(rates, value, from_a, to_b):
         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)
diff --git a/test_currency.py b/test_currency.py
index f254c8f..1f2ae30 100644
--- a/test_currency.py
+++ b/test_currency.py
@@ -14,3 +14,11 @@ def test_conversion():
 
 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

From cf58adb7f412691aff694b1e481363f920c6236d Mon Sep 17 00:00:00 2001
From: grizax <ndbfoster@gmail.com>
Date: Wed, 21 Jan 2015 01:32:23 -0500
Subject: [PATCH 4/4] Fixed pep8 and added another test testing convert
 function

---
 test_currency.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/test_currency.py b/test_currency.py
index 1f2ae30..c906a92 100644
--- a/test_currency.py
+++ b/test_currency.py
@@ -22,3 +22,7 @@ def test_convert_backwards():
 
 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