1 files changed, 28 insertions, 0 deletions
diff --git a/challenge-320/roger-bell-west/python/ch-2.py b/challenge-320/roger-bell-west/python/ch-2.py
new file mode 100755
index 0000000000..8d031fd6f7
--- /dev/null
+++ b/challenge-320/roger-bell-west/python/ch-2.py
@@ -0,0 +1,28 @@
+#! /usr/bin/python3
+
+def sumdifference(a):
+  delta = 0
+  for x in a:
+    if x >= 10:
+      digitsum = 0
+      xa = x
+      while xa > 0:
+        digitsum += xa % 10
+        xa = int(xa / 10)
+      delta += x - digitsum
+  return delta
+
+import unittest
+
+class TestSumdifference(unittest.TestCase):
+
+  def test_ex1(self):
+    self.assertEqual(sumdifference([1, 23, 4, 5]), 18, 'example 1')
+
+  def test_ex2(self):
+    self.assertEqual(sumdifference([1, 2, 3, 4, 5]), 0, 'example 2')
+
+  def test_ex3(self):
+    self.assertEqual(sumdifference([1, 2, 34]), 27, 'example 3')
+
+unittest.main()