1 files changed, 33 insertions, 0 deletions
diff --git a/challenge-266/roger-bell-west/python/ch-2.py b/challenge-266/roger-bell-west/python/ch-2.py
new file mode 100755
index 0000000000..2122921de4
--- /dev/null
+++ b/challenge-266/roger-bell-west/python/ch-2.py
@@ -0,0 +1,33 @@
+#! /usr/bin/python3
+
+def xmatrix(a):
+  order = len(a) - 1
+  valid = True
+  for y, row in enumerate(a):
+    for x, value in enumerate(row):
+      if x == y or x == order - y:
+        if value == 0:
+          valid = False
+      else:
+        if value != 0:
+          valid = False
+      if not valid:
+        break
+    if not valid:
+      break
+  return valid
+
+import unittest
+
+class TestXmatrix(unittest.TestCase):
+
+  def test_ex1(self):
+    self.assertEqual(xmatrix([[1, 0, 0, 2], [0, 3, 4, 0], [0, 5, 6, 0], [7, 0, 0, 1]]), True, 'example 1')
+
+  def test_ex2(self):
+    self.assertEqual(xmatrix([[1, 2, 3], [4, 5, 6], [7, 8, 9]]), False, 'example 2')
+
+  def test_ex3(self):
+    self.assertEqual(xmatrix([[1, 0, 2], [0, 3, 0], [4, 0, 5]]), True, 'example 3')
+
+unittest.main()