1 files changed, 23 insertions, 0 deletions
diff --git a/challenge-113/roger-bell-west/python/ch-2.py b/challenge-113/roger-bell-west/python/ch-2.py
new file mode 100755
index 0000000000..48a01cb2b0
--- /dev/null
+++ b/challenge-113/roger-bell-west/python/ch-2.py
@@ -0,0 +1,23 @@
+#! /usr/bin/python3
+
+import unittest
+
+def rbt(ti):
+  s=0
+  for n in ti:
+    if n>0:
+      s += n
+  to=list()
+  for n in ti:
+    if n>0:
+      to.append(s-n)
+    else:
+      to.append(n)
+  return to
+
+class TestRbt(unittest.TestCase):
+
+        def test_ex1(self):
+          self.assertEqual(rbt([1,2,3,4,-1,5,6,-1,7]),[27,26,25,24,-1,23,22,-1,21],'example 1')
+
+unittest.main()