better solution using pop by Matt

Author: fbkarsdorp

answerbook/Chapter 10 - Learning without Supervision.ipynb

@@ -1,7 +1,7 @@
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  "metadata": {
   "name": "",
-  "signature": "sha256:4a735510c93747b11ebb86855c4f985cce0023c63086b07a69dc1e0d784b3667"
+  "signature": "sha256:caf39a94b435791ab9dd1d40c5df8860ec234626e7807676f49efbe17774d245"
  },
  "nbformat": 3,
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@@ -540,9 +540,8 @@
       "    \n",
       "    def merge(self, i, j):\n",
       "        # insert your code here\n",
-      "        self._clusters[i] = Cluster(self._n, self._clusters[i], self._clusters[j])\n",
+      "        self._clusters[i] = Cluster(self._n, self._clusters[i], self._clusters.pop(j))\n",
       "        self._n += 1\n",
-      "        del self._clusters[j]\n",
       "    \n",
       "    def __str__(self):\n",
       "        return '%s' % self._clusters[0]\n",