1 files changed, 43 insertions, 0 deletions
diff --git a/challenge-187/roger-bell-west/python/ch-1.py b/challenge-187/roger-bell-west/python/ch-1.py
new file mode 100755
index 0000000000..b7be1cd5c4
--- /dev/null
+++ b/challenge-187/roger-bell-west/python/ch-1.py
@@ -0,0 +1,43 @@
+#! /usr/bin/python3
+
+import unittest
+
+from datetime import date, timedelta
+import re
+
+def s2date(ds):
+  dm = re.findall(r"\d+", ds)
+  if len(dm) == 2:
+    return date(2022, int(dm[1]), int(dm[0]))
+
+def daystogether(a, b):
+  starts = sorted([s2date(a[0]), s2date(b[0])])
+  ends = sorted([s2date(a[1]), s2date(b[1])])
+  if ends[0] >= starts[1]:
+    return (ends[0]-starts[1]).days+1
+  else:
+    return 0
+
+class TestDaystogether(unittest.TestCase):
+
+        def test_ex1(self):
+          self.assertEqual(daystogether(["12-01", "20-01"], ["15-01", "18-01"]),
+                           4,
+                           'example 1')
+
+        def test_ex2(self):
+          self.assertEqual(daystogether(["02-03", "12-03"], ["13-03", "14-03"]),
+                           0,
+                           'example 2')
+
+        def test_ex3(self):
+          self.assertEqual(daystogether(["02-03", "12-03"], ["11-03", "15-03"]),
+                           2,
+                           'example 3')
+
+        def test_ex4(self):
+          self.assertEqual(daystogether(["30-03", "05-04"], ["28-03", "02-04"]),
+                           4,
+                           'example 4')
+
+unittest.main()