python: add problem 136 and unittest

Author: supercoderhawk

Python/sln_101_200/__init__.py

@@ -0,0 +1 @@
+# -*- coding: utf-8 -*-

Python/sln_101_200/solution_131_140.py

@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+
+class Solution_131_140:
+    def singleNumber(self, nums):
+        """
+        136
+        :param nums:
+        :return:
+        """
+        val = {}
+        for num in nums:
+            if num not in val:
+                val[num] = 1
+            else:
+                val.pop(num)
+        return list(val.keys())[0]

Python/sln_101_200/test_solution_131_140.py

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+# -*- coding: utf-8 -*-
+from unittest import TestCase
+from sln_101_200.solution_131_140 import Solution_131_140
+
+
+class TestSolution_131_140(TestCase):
+    def setUp(self):
+        self.sln = Solution_131_140()
+
+    def test_singleNumber(self):
+        ret = self.sln.singleNumber([2, 2, 1])
+        self.assertEqual(ret, 1)