Ege_Zeytun_Homework_3.ipynb

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   "source": [
    "*Ege Zeytun\\\n",
    "Homework 3 Week 4*`"
   ]
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   "source": [
    "### <font color = 'blue'> Question </font> "
   ]
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   "source": [
    "l = [[\"a\", \"b\"], [\"a\", \"c\", \"d\"], [\"a\"], [\"b\", \"d\"]]"
   ]
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       "[['a', 'b'], ['a', 'c', 'd'], ['a'], ['b', 'd']]"
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    "l"
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   "source": [
    "- Define a function counter().\n",
    "- It should make a dictionary that shows the number of occurences of each element in the list.\n",
    "\n",
    "Example:\n",
    "`counter(l)`\n",
    "\n",
    "`{\"a\": 3, \"b\": 2, \"c\": 1, \"d\": 2}`\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'a': 3, 'b': 2, 'c': 1, 'd': 2}"
      ]
     },
     "execution_count": 21,
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   "source": [
    "def counter():\n",
    "    d = {}\n",
    "    flat_l = [m for i in l for m in i]\n",
    "    for x in flat_l:\n",
    "        if x in d:\n",
    "            d[x] += 1\n",
    "        else:\n",
    "            d[x] = 1\n",
    "    return d\n",
    "\n",
    "counter()"
   ]
  }
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