1 files changed, 48 insertions, 0 deletions
diff --git a/challenge-202/roger-bell-west/python/ch-2.py b/challenge-202/roger-bell-west/python/ch-2.py
new file mode 100755
index 0000000000..447a12d6f9
--- /dev/null
+++ b/challenge-202/roger-bell-west/python/ch-2.py
@@ -0,0 +1,48 @@
+#! /usr/bin/python3
+
+import unittest
+
+def widestvalley(a):
+  av = []
+  ac = []
+  l = -1
+  for v in a:
+    if v == l:
+      ac[-1] += 1
+    else:
+      av.append(v)
+      ac.append(1)
+      l = v
+  s = []
+  e = []
+  c = 0
+  for i in range(len(av)):
+    if i ==0 or i == len(av) - 1 or (av[i - 1] < av[i] and av[i] > av[i + 1]):
+      s.append(c)
+      e.append(c + ac[i] - 1)
+    c += ac[i]
+  out = []
+  for i in range(len(s) - 1):
+    if e[i+1] - s[i] + 1 > len(out):
+      out = a[s[i] : e[i+1] + 1];
+  return out
+
+
+class TestWidestvalley(unittest.TestCase):
+
+  def test_ex1(self):
+    self.assertEqual(widestvalley([1, 5, 5, 2, 8]), [5, 5, 2, 8], 'example 1')
+
+  def test_ex2(self):
+    self.assertEqual(widestvalley([2, 6, 8, 5]), [2, 6, 8], 'example 2')
+
+  def test_ex3(self):
+    self.assertEqual(widestvalley([9, 8, 13, 13, 2, 2, 15, 17]), [13, 13, 2, 2, 15, 17], 'example 3')
+
+  def test_ex4(self):
+    self.assertEqual(widestvalley([2, 1, 2, 1, 3]), [2, 1, 2], 'example 4')
+
+  def test_ex5(self):
+    self.assertEqual(widestvalley([1, 3, 3, 2, 1, 2, 3, 3, 2]), [3, 3, 2, 1, 2, 3, 3], 'example 5')
+
+unittest.main()