Merge pull request exercism#10 from sjakobi/series

New exercise: python series

EXERCISES.txt

@@ -5,6 +5,7 @@ word-count
 anagram
 beer-song
 nucleotide-count
+series
 point-mutations
 phone-number
 grade-school

series/example.py

@@ -0,0 +1,11 @@
+class Series(object):
+    def __init__(self, digits):
+        self.digits = digits
+        self.numbers = [int(d) for d in digits]
+
+    def slices(self, length):
+        if not 1 <= length <= len(self.numbers):
+            raise ValueError("Invalid slice length for this series: " +
+                             str(length))
+        return [self.numbers[i:i + length]
+                for i in range(len(self.numbers) - length + 1)]

series/series_test.py

@@ -0,0 +1,44 @@
+try:
+    from series import Series
+except ImportError:
+    raise SystemExit('Could not find series.py. Does it exist?')
+
+import unittest
+
+
+class SeriesTest(unittest.TestCase):
+    def test_slices_of_one(self):
+        self.assertEqual([[0], [1], [2], [3], [4]],
+                         Series("01234").slices(1))
+
+    def test_slices_of_two(self):
+        self.assertEqual([[9, 7], [7, 8], [8, 6], [6, 7],
+                          [7, 5], [5, 6], [6, 4]],
+                         Series("97867564").slices(2))
+
+    def test_slices_of_three(self):
+        self.assertEqual([[9, 7, 8], [7, 8, 6], [8, 6, 7],
+                          [6, 7, 5], [7, 5, 6], [5, 6, 4]],
+                         Series("97867564").slices(3))
+
+    def test_slices_of_four(self):
+        self.assertEqual([[0, 1, 2, 3], [1, 2, 3, 4]],
+                         Series("01234").slices(4))
+
+    def test_slices_of_five(self):
+        self.assertEqual([[0, 1, 2, 3, 4]],
+                         Series("01234").slices(5))
+
+    def test_overly_long_slice(self):
+        self.assertRaisesRegexp(ValueError,
+                                "^Invalid slice length for this series: 4$",
+                                Series("012").slices, 4)
+
+    def test_overly_short_slice(self):
+        self.assertRaisesRegexp(ValueError,
+                                "^Invalid slice length for this series: 0$",
+                                Series("01234").slices, 0)
+
+
+if __name__ == '__main__':
+    unittest.main()