Solved 42 and 43.

ipython/EulerProblem042.ipynb

@@ -20,6 +20,49 @@
     "Using words.txt (right click and 'Save Link/Target As...'), a 16K text file containing nearly two-thousand common English words, how many are triangle words? (The file is saved in the same directory as this notebook file as EulerProblem042.txt)"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def get_words():\n",
+    "    with open(\"EulerProblem042.txt\", \"r\") as f:\n",
+    "        s = f.read()\n",
+    "    words = [w.strip('\"') for w in s.split(\",\")]\n",
+    "    return words\n",
+    "\n",
+    "def calculate_word_value(word):\n",
+    "    word = word.upper()\n",
+    "    return sum([ord(letter) - 64 for letter in word])\n",
+    "\n",
+    "assert(calculate_word_value(\"sky\") == 55)\n",
+    "\n",
+    "def get_triangle_numbers(n):\n",
+    "    return {n * (n + 1) // 2 for n in range(1, 101)}"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "162\n"
+     ]
+    }
+   ],
+   "source": [
+    "triangle_numbers = get_triangle_numbers(100)\n",
+    "\n",
+    "s = len([word for word in get_words() if calculate_word_value(word) in triangle_numbers])\n",
+    "assert(s == 162)\n",
+    "print(s)"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -31,7 +74,7 @@
   }
  ],
  "metadata": {
-  "completion_date": "",
+  "completion_date": "Thu, 20 Dec 2018, 16:14",
   "kernelspec": {
    "display_name": "Python 3",
    "language": "python3.6",