add python solution for array_rotate

array_rotate/solutions/rotate.py

@@ -0,0 +1,9 @@
+def rotate(array, n):
+    length = len(array)
+    if length == n or n == 0:
+        return array
+    else:
+        result = [0] * length
+        for i in xrange(length):
+            result[(i+n) % length] = array[i]
+        return result

test_rotate.py

@@ -0,0 +1,31 @@
+#!/bin/usr/env python
+import unittest
+from rotate import rotate as r
+
+
+class RotateTestCase(unittest.TestCase):
+    def setUp(self):
+        test = [1, 2, 3]
+        self.test_cases = (
+            (test, 3),
+            (test, 0),
+            (test, 4),
+            (test, 5),
+            (test, 1)
+        )
+        self.test_answers = (
+            test, test,
+            [3, 1, 2], [2, 3, 1],
+            [3, 1, 2]
+        )
+
+    def tearDown(self):
+        del self.test_cases
+        del self.test_answers
+
+    def test_rotate_function(self):
+        for idx, test_case in enumerate(self.test_cases):
+            self.assertEqual(r(*test_case), self.test_answers[idx])
+
+if __name__ == '__main__':
+    unittest.main()