1 files changed, 36 insertions, 0 deletions
diff --git a/challenge-272/roger-bell-west/python/ch-2.py b/challenge-272/roger-bell-west/python/ch-2.py
new file mode 100755
index 0000000000..4332977373
--- /dev/null
+++ b/challenge-272/roger-bell-west/python/ch-2.py
@@ -0,0 +1,36 @@
+#! /usr/bin/python3
+
+import collections
+from itertools import islice
+
+# https://docs.python.org/3/library/itertools.html
+def sliding_window(iterable, n):
+    # sliding_window('ABCDEFG', 4) --> ABCD BCDE CDEF DEFG
+    it = iter(iterable)
+    window = collections.deque(islice(it, n), maxlen=n)
+    if len(window) == n:
+        yield tuple(window)
+    for x in it:
+        window.append(x)
+        yield tuple(window)
+
+def stringscore(a):
+  out = 0
+  for i in sliding_window(a, 2):
+    out += abs(ord(i[0]) - ord(i[1]))
+  return out
+
+import unittest
+
+class TestStringscore(unittest.TestCase):
+
+  def test_ex1(self):
+    self.assertEqual(stringscore("hello"), 13, 'example 1')
+
+  def test_ex2(self):
+    self.assertEqual(stringscore("perl"), 30, 'example 2')
+
+  def test_ex3(self):
+    self.assertEqual(stringscore("raku"), 37, 'example 3')
+
+unittest.main()