1 files changed, 32 insertions, 0 deletions
diff --git a/challenge-275/roger-bell-west/python/ch-2.py b/challenge-275/roger-bell-west/python/ch-2.py
new file mode 100755
index 0000000000..fe1a9c1eee
--- /dev/null
+++ b/challenge-275/roger-bell-west/python/ch-2.py
@@ -0,0 +1,32 @@
+#! /usr/bin/python3
+
+def replacedigits(a):
+  out = ""
+  prev = 0
+  digits = {chr(asc) for asc in list(range(ord('0'), ord('9')+1))}
+  for c in a:
+    if c >= '0' and c <= '9':
+      out += chr(prev + int(c))
+    else:
+      prev = ord(c)
+      out += c
+  return out
+    
+
+import unittest
+
+class TestReplacedigits(unittest.TestCase):
+
+  def test_ex1(self):
+    self.assertEqual(replacedigits("a1c1e1"), "abcdef", 'example 1')
+
+  def test_ex2(self):
+    self.assertEqual(replacedigits("a1b2c3d4"), "abbdcfdh", 'example 2')
+
+  def test_ex3(self):
+    self.assertEqual(replacedigits("b2b"), "bdb", 'example 3')
+
+  def test_ex4(self):
+    self.assertEqual(replacedigits("a16z"), "abgz", 'example 4')
+
+unittest.main()