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   "source": [
    "[prev: *String Services*](stdlib-string-services.ipynb) | [home](../index.ipynb) | [next: *Numeric tools*](stdlib-numeric-tools.ipynb)"
   ]
  },
  {
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   "source": [
    "# *Data Types*\n",
    "Modules introduisant des types de données spécifiques."
   ]
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   "source": [
    "## Module *collections* \n",
    "*collections* proposent 5 nouveaux conteneurs."
   ]
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   "metadata": {},
   "source": [
    "``` python\n",
    "import collections\n",
    "\n",
    "collections.namedtuple   # factory function for creating tuple subclasses with named fields\n",
    "collections.deque        # list-like container with fast appends and pops on either end\n",
    "collections.Counter      # dict subclass for counting hashable objects\n",
    "collections.OrderedDict  # dict subclass that remembers the order entries were added\n",
    "collections.defaultdict  # dict subclass that calls a factory function to supply missing values\n",
    "```"
   ]
  },
  {
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   "metadata": {},
   "source": [
    "## Exercices"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Aidé du module `collections`, réécrire une fonction `compte_occurences()`."
   ]
  }
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