Fix #13, PEP8-ify notebooks.

arrays_strings/permutation/permutation_solution.ipynb

@@ -35,7 +35,6 @@
    "source": [
     "## Constraints\n",
     "\n",
-
     "* Can we assume the string is ASCII?\n",
     "    * Yes\n",
     "    * Note: Unicode strings could require special handling depending on your language\n",
@@ -147,6 +146,7 @@
     "        dict_chars[char] += 1\n",
     "    return dict_chars\n",
     "\n",
+    "\n",
     "def permutations_alt(str1, str2):\n",
     "    if len(str1) != len(str2):\n",
     "        return False\n",
@@ -183,7 +183,7 @@
     "\n",
     "\n",
     "class TestPermutation(object):\n",
-    "    \n",
+    "\n",
     "    def test_permutation(self, func):\n",
     "        assert_equal(func('', 'foo'), False)\n",
     "        assert_equal(func('Nib', 'bin'), False)\n",
@@ -191,6 +191,7 @@
     "        assert_equal(func('a ct', 'ca t'), True)\n",
     "        print('Success: test_permutation')\n",
     "\n",
+    "\n",
     "def main():\n",
     "    test = TestPermutation()\n",
     "    test.test_permutation(permutations)\n",
@@ -200,7 +201,8 @@
     "        # Alternate solutions are only defined\n",
     "        # in the solutions file\n",
     "        pass\n",
-    "    \n",
+    "\n",
+    "\n",
     "if __name__ == '__main__':\n",
     "    main()"
    ]