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   "source": [
    "[prev: Listes en intention](list-comprehension.ipynb) | [home](../index.ipynb) | [next: Les générateurs](generator.ipynb)"
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   "source": [
    "# Fonctions d'ordre supérieur\n"
   ]
  },
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   "source": [
    "On parle de fonction d'ordre supérieur quand cette fonction :\n",
    "\n",
    "- prend une ou plusieurs fonctions en argument\n",
    "- renvoie une fonction\n",
    "\n",
    "Chacune de ces deux propriétés est possible en Python. Il s'agit souvent d'un moyen rendre un code plus modulaire en séparant les logiques internes."
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     "text": [
      "Bonne appétit\n",
      "\n",
      "</''''''''''\\>\n",
      " OO tomate OO \n",
      " -- jambon -- \n",
      " ~~ salade ~~ \n",
      "<\\__________/>\n"
     ]
    }
   ],
   "source": [
    "# Un exemple de fonctions que l'on peut composer entre elles\n",
    "\n",
    "\n",
    "def pain(func):\n",
    "    def wrapper():\n",
    "        print(\"</''''''''''\\>\")\n",
    "        func()\n",
    "        print(\"<\\__________/>\")\n",
    "    return wrapper\n",
    "        \n",
    "\n",
    "def garniture(func):\n",
    "    def wrapper():\n",
    "        print(\" OO tomate OO \")\n",
    "        func()\n",
    "        print(\" ~~ salade ~~ \")\n",
    "    return wrapper\n",
    "\n",
    "\n",
    "def jambon():\n",
    "    print(\" -- jambon -- \")\n",
    "\n",
    "    \n",
    "sandwich = pain(garniture(jambon))\n",
    "\n",
    "print(\"Bonne appétit\")\n",
    "print()\n",
    "sandwich()"
   ]
  },
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   "metadata": {},
   "source": [
    "## Exercices\n",
    "\n",
    "Ecrire le corps de la fonction suivante:\n",
    "``` python\n",
    "def deriv(func, epsilon=1e-6):\n",
    "    \"\"\" renvoie la fonction dérivée de func\n",
    "    \n",
    "    Le calcul de la dérivée est fait par différence finie:\n",
    "    \n",
    "        f_prime(x) = ( f(x+epsilon) - f(x) ) / epsilon\n",
    "        \n",
    "    \"\"\"\n",
    "    pass\n",
    "```"
   ]
  }
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