1 files changed, 19 insertions, 0 deletions
diff --git a/challenge-273/bruce-gray/python/ch-2.py b/challenge-273/bruce-gray/python/ch-2.py
new file mode 100755
index 0000000000..d1ce92088f
--- /dev/null
+++ b/challenge-273/bruce-gray/python/ch-2.py
@@ -0,0 +1,19 @@
+#!python
+import re
+
+def task2(str):
+    p = re.compile('^[^b]*b[^a]*$')
+    return bool(p.match(str))
+
+
+import unittest
+class TestTask1(unittest.TestCase):
+    def t(self, str, expected):
+        self.assertEqual(task2(str), expected, f"task2('{str}')")
+
+    def test_1(self): self.t('aabb' , True )
+    def test_2(self): self.t('abab' , False)
+    def test_3(self): self.t('aaa'  , False)
+    def test_4(self): self.t('bbb'  , True )
+
+unittest.main()