1 files changed, 28 insertions, 0 deletions
diff --git a/challenge-255/roger-bell-west/python/ch-2.py b/challenge-255/roger-bell-west/python/ch-2.py
new file mode 100755
index 0000000000..83d7b801e7
--- /dev/null
+++ b/challenge-255/roger-bell-west/python/ch-2.py
@@ -0,0 +1,28 @@
+#! /usr/bin/python3
+
+from collections import defaultdict
+import re
+
+def mostfrequentword(para, banned):
+  words = defaultdict(lambda: 0)
+  r = re.compile(r"[^A-Za-z]+")
+  for v in re.split(r, para):
+    if len(v) > 0:
+      words[v] += 1
+  del words[banned]
+  m = max(words.values())
+  v = [w for w in words.keys() if words[w] == m]
+  v.sort()
+  return v[0]
+
+import unittest
+
+class TestMostfrequentword(unittest.TestCase):
+
+  def test_ex1(self):
+    self.assertEqual(mostfrequentword("Joe hit a ball, the hit ball flew far after it was hit.", "hit"), "ball", 'example 1')
+
+  def test_ex2(self):
+    self.assertEqual(mostfrequentword("Perl and Raku belong to the same family. Perl is the most popular language in the weekly challenge.", "the"), "Perl", 'example 2')
+
+unittest.main()